Errors in running code in vignettes:
when running code in 'wnominate.Rnw'

> library(wnominate)
Loading required package: pscl
Classes and Methods for R developed in the
Political Science Computational Laboratory
Department of Political Science
Stanford University
Simon Jackman
hurdle and zeroinfl functions by Achim Zeileis

## W-NOMINATE Ideal Point Package
## Copyright 2006 -2021
## Keith Poole, Jeffrey Lewis, James Lo, and Royce Carroll
## Support provided by the U.S. National Science Foundation
## NSF Grant SES-0611974


> data(sen90)

> sen90
Source:		 C:/sen90kh.ord 
Number of Legislators:	 102 
Number of Votes:	 596 

Using the following codes to represent roll call votes:
Yea:		 1 2 3 
Nay:		 4 5 6 
Abstentions:	 7 8 9 
Not In Legislature:	 0 

Legislator-specific variables:
[1] "state"      "icpsrState" "cd"         "icpsrLegis" "party"     
[6] "partyCode" 
Detailed information is available via the summary function.

> selector <- c(21, 22, 44, 45, 46, 47, 48, 49, 50, 
+     53, 54, 55, 56, 58, 59, 60, 61, 62, 65, 66, 67, 68, 69, 70, 
+     71, 72, 73, 74, 75, 77,  .... [TRUNCATED] 

> sen90$m <- length(selector)

> sen90$votes <- sen90$votes[, selector]

> rownames(sen90$votes)[1:12]
 [1] "JOHNSON (D USA)"  "SPARKMAN (D AL)"  "HILL (D AL)"      "GRUENING (D AK)" 
 [5] "BARTLETT (D AK)"  "HAYDEN (D AZ)"    "FANNIN (R AZ)"    "FULBRIGHT (D AR)"
 [9] "MCCLELLAN (D AR)" "KUCHEL (R CA)"    "MURPHY (R CA)"    "DOMINICK (R CO)" 

> result <- wnominate(sen90, polarity = c(2, 5))

Preparing to run W-NOMINATE...

	Checking data...

		... 1 of 102 total members dropped.

		Votes dropped:
		... 36 of 208 total votes dropped.

	Running W-NOMINATE...

		Getting bill parameters...
		Getting legislator coordinates...
		Starting estimation of Beta...
		Getting bill parameters...
		Getting legislator coordinates...
		Starting estimation of Beta...
		Getting bill parameters...
		Getting legislator coordinates...
		Getting bill parameters...
		Getting legislator coordinates...
		Estimating weights...
		Getting bill parameters...
		Getting legislator coordinates...
		Estimating weights...
		Getting bill parameters...
		Getting legislator coordinates...


W-NOMINATE estimation completed successfully.
W-NOMINATE took 12.16 seconds to execute.


> summary(result)


SUMMARY OF W-NOMINATE OBJECT
----------------------------

Number of Legislators:	  101 (1 legislators deleted)
Number of Votes:	  172 (36 votes deleted)
Number of Dimensions:	  2
Predicted Yeas:		  6552 of 7732 (84.7%) predictions correct
Predicted Nays:		  6426 of 7570 (84.9%) predictions correct
Correct Classifiction:	  79.79% 84.81%
APRE:			  0.365 0.523
GMP:			  0.652 0.709 


The first 10 legislator estimates are:
                 coord1D coord2D
JOHNSON (D USA)   -0.485  -0.146
SPARKMAN (D AL)    0.374   0.759
HILL (D AL)        0.590   0.714
GRUENING (D AK)   -0.701   0.713
BARTLETT (D AK)   -0.533   0.846
HAYDEN (D AZ)      0.155   0.883
FANNIN (R AZ)      0.806  -0.245
FULBRIGHT (D AR)   0.175   0.436
MCCLELLAN (D AR)   0.810   0.294
KUCHEL (R CA)     -0.200  -0.292

> plot(result)

  When sourcing 'wnominate.R':
Error: formal argument "at" matched by multiple actual arguments
Execution halted

  'wnominate.Rnw'... failed