Running examples in 'sirt-Ex.R' failed
The error most likely occurred in:

> ### Name: truescore.irt
> ### Title: Conversion of Trait Scores theta into True Scores tau ( theta )
> ### Aliases: truescore.irt
> 
> ### ** Examples
> 
> #############################################################################
> # EXAMPLE 1: Dataset with mixed dichotomous and polytomous responses
> #############################################################################
> 
> data(data.mixed1)
> dat <- data.mixed1
> 
> #****
> # Model 1: Partial credit model
> # estimate model with TAM package
> library(TAM)
Loading required package: CDM
Loading required package: mvtnorm
**********************************
** CDM 7.5-15 (2020-03-10 14:19:21)      
** Cognitive Diagnostic Models  **
**********************************

* TAM 3.4-26 (2020-03-10 13:09:18)
> mod1 <- TAM::tam.mml( dat )
....................................................
Processing Data      2020-05-07 12:45:54 
    * Response Data: 1000 Persons and  37 Items 
    * Numerical integration with 21 nodes
    * Created Design Matrices   ( 2020-05-07 12:45:54 )
    * Calculated Sufficient Statistics   ( 2020-05-07 12:45:54 )
....................................................
Iteration 1     2020-05-07 12:45:54
E Step
M Step Intercepts   |----
  Deviance = 41679.4725
  Maximum item intercept parameter change: 1.097468
  Maximum item slope parameter change: 0
  Maximum regression parameter change: 0
  Maximum variance parameter change: 0.147574
....................................................
Iteration 2     2020-05-07 12:45:54
E Step
M Step Intercepts   |----
  Deviance = 41115.5793 | Absolute change: 563.8932 | Relative change: 0.01371483
  Maximum item intercept parameter change: 0.402393
  Maximum item slope parameter change: 0
  Maximum regression parameter change: 0
  Maximum variance parameter change: 0.044813
....................................................
Iteration 3     2020-05-07 12:45:54
E Step
M Step Intercepts   |----
  Deviance = 41079.2908 | Absolute change: 36.2886 | Relative change: 0.00088338
  Maximum item intercept parameter change: 0.600725
  Maximum item slope parameter change: 0
  Maximum regression parameter change: 0
  Maximum variance parameter change: 0.031313
....................................................
Iteration 4     2020-05-07 12:45:54
E Step
M Step Intercepts   |----
  Deviance = 41060.2615 | Absolute change: 19.0293 | Relative change: 0.00046345
  Maximum item intercept parameter change: 0.140181
  Maximum item slope parameter change: 0
  Maximum regression parameter change: 0
  Maximum variance parameter change: 0.014914
....................................................
Iteration 5     2020-05-07 12:45:54
E Step
M Step Intercepts   |----
  Deviance = 41056.2771 | Absolute change: 3.9844 | Relative change: 9.705e-05
  Maximum item intercept parameter change: 0.093257
  Maximum item slope parameter change: 0
  Maximum regression parameter change: 0
  Maximum variance parameter change: 0.007343
....................................................
Iteration 6     2020-05-07 12:45:54
E Step
M Step Intercepts   |----
  Deviance = 41054.3219 | Absolute change: 1.9553 | Relative change: 4.763e-05
  Maximum item intercept parameter change: 0.077605
  Maximum item slope parameter change: 0
  Maximum regression parameter change: 0
  Maximum variance parameter change: 0.002837
....................................................
Iteration 7     2020-05-07 12:45:54
E Step
M Step Intercepts   |----
  Deviance = 41053.2118 | Absolute change: 1.1101 | Relative change: 2.704e-05
  Maximum item intercept parameter change: 0.048412
  Maximum item slope parameter change: 0
  Maximum regression parameter change: 0
  Maximum variance parameter change: 0.002066
....................................................
Iteration 8     2020-05-07 12:45:54
E Step
M Step Intercepts   |----
  Deviance = 41052.7236 | Absolute change: 0.4882 | Relative change: 1.189e-05
  Maximum item intercept parameter change: 0.040597
  Maximum item slope parameter change: 0
  Maximum regression parameter change: 0
  Maximum variance parameter change: 0.000605
....................................................
Iteration 9     2020-05-07 12:45:54
E Step
M Step Intercepts   |----
  Deviance = 41052.4106 | Absolute change: 0.313 | Relative change: 7.62e-06
  Maximum item intercept parameter change: 0.026275
  Maximum item slope parameter change: 0
  Maximum regression parameter change: 0
  Maximum variance parameter change: 0.000711
....................................................
Iteration 10     2020-05-07 12:45:54
E Step
M Step Intercepts   |----
  Deviance = 41052.2626 | Absolute change: 0.148 | Relative change: 3.61e-06
  Maximum item intercept parameter change: 0.022903
  Maximum item slope parameter change: 0
  Maximum regression parameter change: 0
  Maximum variance parameter change: 0.00012
....................................................
Iteration 11     2020-05-07 12:45:54
E Step
M Step Intercepts   |----
  Deviance = 41052.1584 | Absolute change: 0.1041 | Relative change: 2.54e-06
  Maximum item intercept parameter change: 0.014871
  Maximum item slope parameter change: 0
  Maximum regression parameter change: 0
  Maximum variance parameter change: 0.000297
....................................................
Iteration 12     2020-05-07 12:45:54
E Step
M Step Intercepts   |----
  Deviance = 41052.1087 | Absolute change: 0.0497 | Relative change: 1.21e-06
  Maximum item intercept parameter change: 0.012993
  Maximum item slope parameter change: 0
  Maximum regression parameter change: 0
  Maximum variance parameter change: 2.3e-05
....................................................
Iteration 13     2020-05-07 12:45:54
E Step
M Step Intercepts   |----
  Deviance = 41052.0733 | Absolute change: 0.0354 | Relative change: 8.6e-07
  Maximum item intercept parameter change: 0.008444
  Maximum item slope parameter change: 0
  Maximum regression parameter change: 0
  Maximum variance parameter change: 0.000135
....................................................
Iteration 14     2020-05-07 12:45:54
E Step
M Step Intercepts   |----
  Deviance = 41052.0561 | Absolute change: 0.0172 | Relative change: 4.2e-07
  Maximum item intercept parameter change: 0.007273
  Maximum item slope parameter change: 0
  Maximum regression parameter change: 0
  Maximum variance parameter change: 5e-06
....................................................
Iteration 15     2020-05-07 12:45:54
E Step
M Step Intercepts   |----
  Deviance = 41052.044 | Absolute change: 0.0121 | Relative change: 2.9e-07
  Maximum item intercept parameter change: 0.004714
  Maximum item slope parameter change: 0
  Maximum regression parameter change: 0
  Maximum variance parameter change: 6.3e-05
....................................................
Iteration 16     2020-05-07 12:45:54
E Step
M Step Intercepts   |----
  Deviance = 41052.0379 | Absolute change: 0.0061 | Relative change: 1.5e-07
  Maximum item intercept parameter change: 0.004005
  Maximum item slope parameter change: 0
  Maximum regression parameter change: 0
  Maximum variance parameter change: 2e-06
....................................................
Iteration 17     2020-05-07 12:45:54
E Step
M Step Intercepts   |----
  Deviance = 41052.0336 | Absolute change: 0.0043 | Relative change: 1e-07
  Maximum item intercept parameter change: 0.002565
  Maximum item slope parameter change: 0
  Maximum regression parameter change: 0
  Maximum variance parameter change: 3.2e-05
....................................................
Iteration 18     2020-05-07 12:45:54
E Step
M Step Intercepts   |----
  Deviance = 41052.0314 | Absolute change: 0.0022 | Relative change: 5e-08
  Maximum item intercept parameter change: 0.002211
  Maximum item slope parameter change: 0
  Maximum regression parameter change: 0
  Maximum variance parameter change: 1e-06
....................................................
Iteration 19     2020-05-07 12:45:54
E Step
M Step Intercepts   |----
  Deviance = 41052.0298 | Absolute change: 0.0016 | Relative change: 4e-08
  Maximum item intercept parameter change: 0.001376
  Maximum item slope parameter change: 0
  Maximum regression parameter change: 0
  Maximum variance parameter change: 3e-06
....................................................
Iteration 20     2020-05-07 12:45:54
E Step
M Step Intercepts   |----
  Deviance = 41052.0289 | Absolute change: 9e-04 | Relative change: 2e-08
  Maximum item intercept parameter change: 0.001395
  Maximum item slope parameter change: 0
  Maximum regression parameter change: 0
  Maximum variance parameter change: 2e-06
....................................................
Iteration 21     2020-05-07 12:45:54
E Step
M Step Intercepts   |----
  Deviance = 41052.0282 | Absolute change: 7e-04 | Relative change: 2e-08
  Maximum item intercept parameter change: 0.000372
  Maximum item slope parameter change: 0
  Maximum regression parameter change: 0
  Maximum variance parameter change: 9e-06
....................................................
Iteration 22     2020-05-07 12:45:54
E Step
M Step Intercepts   |----
  Deviance = 41052.0279 | Absolute change: 3e-04 | Relative change: 1e-08
  Maximum item intercept parameter change: 0.000238
  Maximum item slope parameter change: 0
  Maximum regression parameter change: 0
  Maximum variance parameter change: 2e-06
....................................................
Iteration 23     2020-05-07 12:45:54
E Step
M Step Intercepts   |----
  Deviance = 41052.0277 | Absolute change: 2e-04 | Relative change: 1e-08
  Maximum item intercept parameter change: 0.000184
  Maximum item slope parameter change: 0
  Maximum regression parameter change: 0
  Maximum variance parameter change: 1e-06
....................................................
Iteration 24     2020-05-07 12:45:54
E Step
M Step Intercepts   |----
  Deviance = 41052.0275 | Absolute change: 2e-04 | Relative change: 0
  Maximum item intercept parameter change: 0.000155
  Maximum item slope parameter change: 0
  Maximum regression parameter change: 0
  Maximum variance parameter change: 2e-06
....................................................
Iteration 25     2020-05-07 12:45:54
E Step
M Step Intercepts   |---
  Deviance = 41052.0274 | Absolute change: 1e-04 | Relative change: 0
  Maximum item intercept parameter change: 0.00014
  Maximum item slope parameter change: 0
  Maximum regression parameter change: 0
  Maximum variance parameter change: 2e-06
....................................................
Iteration 26     2020-05-07 12:45:54
E Step
M Step Intercepts   |--
  Deviance = 41052.0273 | Absolute change: 1e-04 | Relative change: 0
  Maximum item intercept parameter change: 8.8e-05
  Maximum item slope parameter change: 0
  Maximum regression parameter change: 0
  Maximum variance parameter change: 1e-06
....................................................
Item Parameters
   xsi.index xsi.label     est
1          1  I01_Cat1 -3.2251
2          2  I02_Cat1 -1.4841
3          3  I03_Cat1  1.8576
4          4  I04_Cat1 -2.5364
5          5  I05_Cat1 -1.7538
6          6  I06_Cat1  0.3802
7          7  I07_Cat1  1.3761
8          8  I08_Cat1 -1.0936
9          9  I09_Cat1  3.7502
10        10  I10_Cat1  1.6307
11        11  I11_Cat1 -0.8127
12        12  I12_Cat1  0.2715
13        13  I13_Cat1 -1.4841
14        14  I14_Cat1  0.7787
15        15  I15_Cat1 -1.0598
16        16  I16_Cat1 -0.8439
17        17  I17_Cat1 -0.9990
18        18  I18_Cat1 -0.4210
19        19  I19_Cat1 -0.4067
20        20  I20_Cat1  0.4953
21        21  I21_Cat1 -1.0591
22        22  I21_Cat2 -2.4062
23        23  I21_Cat3  1.1217
24        24  I21_Cat4 -1.6049
25        25  I22_Cat1 -0.0234
26        26  I22_Cat2  0.2138
27        27  I22_Cat3  0.3715
28        28  I22_Cat4  1.4959
29        29  I23_Cat1 -0.2694
30        30  I24_Cat1 -0.0175
31        31  I25_Cat1  0.4953
32        32  I26_Cat1 -1.7922
33        33  I27_Cat1 -1.6645
34        34  I28_Cat1 -2.2033
35        35  I29_Cat1 -3.3133
36        36  I30_Cat1 -0.0082
37        37  I31_Cat1  0.7787
38        38  I32_Cat1  0.0522
39        39  I33_Cat1  0.0847
40        40  I34_Cat1  1.4862
41        41  I35_Cat1 -1.4709
42        42  I36_Cat1 -0.8807
43        43  I37_Cat1 -0.6953
...................................
Regression Coefficients
     [,1]
[1,]    0

Variance:
       [,1]
[1,] 0.7471


EAP Reliability:
[1] 0.848

-----------------------------
Start:  2020-05-07 12:45:54
End:  2020-05-07 12:45:54 
Time difference of 0.1715999 secs

Error in as.POSIXct.default(e) : 
  do not know how to convert 'e' to class "POSIXct"
Calls: <Anonymous> ... unlist -> lapply -> FUN -> as.POSIXct -> as.POSIXct.default
Execution halted