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

> ### Name: acs.lookup
> ### Title: Search for relevant demographic variables and tables from the US
> ###   Census.
> ### Aliases: acs.lookup
> 
> ### ** Examples
> 
> acs.lookup(endyear=2014, span=5, table.number="B01001")
An object of class "acs.lookup"
endyear= 2014  ; span= 5 

results:
   variable.code table.number table.name             variable.name
1     B01001_001       B01001 Sex by Age                    Total:
2     B01001_002       B01001 Sex by Age                     Male:
3     B01001_003       B01001 Sex by Age       Male: Under 5 years
4     B01001_004       B01001 Sex by Age        Male: 5 to 9 years
5     B01001_005       B01001 Sex by Age      Male: 10 to 14 years
6     B01001_006       B01001 Sex by Age      Male: 15 to 17 years
7     B01001_007       B01001 Sex by Age     Male: 18 and 19 years
8     B01001_008       B01001 Sex by Age            Male: 20 years
9     B01001_009       B01001 Sex by Age            Male: 21 years
10    B01001_010       B01001 Sex by Age      Male: 22 to 24 years
11    B01001_011       B01001 Sex by Age      Male: 25 to 29 years
12    B01001_012       B01001 Sex by Age      Male: 30 to 34 years
13    B01001_013       B01001 Sex by Age      Male: 35 to 39 years
14    B01001_014       B01001 Sex by Age      Male: 40 to 44 years
15    B01001_015       B01001 Sex by Age      Male: 45 to 49 years
16    B01001_016       B01001 Sex by Age      Male: 50 to 54 years
17    B01001_017       B01001 Sex by Age      Male: 55 to 59 years
18    B01001_018       B01001 Sex by Age     Male: 60 and 61 years
19    B01001_019       B01001 Sex by Age      Male: 62 to 64 years
20    B01001_020       B01001 Sex by Age     Male: 65 and 66 years
21    B01001_021       B01001 Sex by Age      Male: 67 to 69 years
22    B01001_022       B01001 Sex by Age      Male: 70 to 74 years
23    B01001_023       B01001 Sex by Age      Male: 75 to 79 years
24    B01001_024       B01001 Sex by Age      Male: 80 to 84 years
25    B01001_025       B01001 Sex by Age   Male: 85 years and over
26    B01001_026       B01001 Sex by Age                   Female:
27    B01001_027       B01001 Sex by Age     Female: Under 5 years
28    B01001_028       B01001 Sex by Age      Female: 5 to 9 years
29    B01001_029       B01001 Sex by Age    Female: 10 to 14 years
30    B01001_030       B01001 Sex by Age    Female: 15 to 17 years
31    B01001_031       B01001 Sex by Age   Female: 18 and 19 years
32    B01001_032       B01001 Sex by Age          Female: 20 years
33    B01001_033       B01001 Sex by Age          Female: 21 years
34    B01001_034       B01001 Sex by Age    Female: 22 to 24 years
35    B01001_035       B01001 Sex by Age    Female: 25 to 29 years
36    B01001_036       B01001 Sex by Age    Female: 30 to 34 years
37    B01001_037       B01001 Sex by Age    Female: 35 to 39 years
38    B01001_038       B01001 Sex by Age    Female: 40 to 44 years
39    B01001_039       B01001 Sex by Age    Female: 45 to 49 years
40    B01001_040       B01001 Sex by Age    Female: 50 to 54 years
41    B01001_041       B01001 Sex by Age    Female: 55 to 59 years
42    B01001_042       B01001 Sex by Age   Female: 60 and 61 years
43    B01001_043       B01001 Sex by Age    Female: 62 to 64 years
44    B01001_044       B01001 Sex by Age   Female: 65 and 66 years
45    B01001_045       B01001 Sex by Age    Female: 67 to 69 years
46    B01001_046       B01001 Sex by Age    Female: 70 to 74 years
47    B01001_047       B01001 Sex by Age    Female: 75 to 79 years
48    B01001_048       B01001 Sex by Age    Female: 80 to 84 years
49    B01001_049       B01001 Sex by Age Female: 85 years and over

> acs.lookup(endyear=2012, span=1, table.number="B01001", keyword="Female")
An object of class "acs.lookup"
endyear= 2012  ; span= 1 

results:
   variable.code table.number table.name             variable.name
1     B01001_026       B01001 Sex by Age                   Female:
2     B01001_027       B01001 Sex by Age     Female: Under 5 years
3     B01001_028       B01001 Sex by Age      Female: 5 to 9 years
4     B01001_029       B01001 Sex by Age    Female: 10 to 14 years
5     B01001_030       B01001 Sex by Age    Female: 15 to 17 years
6     B01001_031       B01001 Sex by Age   Female: 18 and 19 years
7     B01001_032       B01001 Sex by Age          Female: 20 years
8     B01001_033       B01001 Sex by Age          Female: 21 years
9     B01001_034       B01001 Sex by Age    Female: 22 to 24 years
10    B01001_035       B01001 Sex by Age    Female: 25 to 29 years
11    B01001_036       B01001 Sex by Age    Female: 30 to 34 years
12    B01001_037       B01001 Sex by Age    Female: 35 to 39 years
13    B01001_038       B01001 Sex by Age    Female: 40 to 44 years
14    B01001_039       B01001 Sex by Age    Female: 45 to 49 years
15    B01001_040       B01001 Sex by Age    Female: 50 to 54 years
16    B01001_041       B01001 Sex by Age    Female: 55 to 59 years
17    B01001_042       B01001 Sex by Age   Female: 60 and 61 years
18    B01001_043       B01001 Sex by Age    Female: 62 to 64 years
19    B01001_044       B01001 Sex by Age   Female: 65 and 66 years
20    B01001_045       B01001 Sex by Age    Female: 67 to 69 years
21    B01001_046       B01001 Sex by Age    Female: 70 to 74 years
22    B01001_047       B01001 Sex by Age    Female: 75 to 79 years
23    B01001_048       B01001 Sex by Age    Female: 80 to 84 years
24    B01001_049       B01001 Sex by Age Female: 85 years and over

> acs.lookup(endyear=2012, span=1, keyword=c("Female", "GED"))
No such file or directoryfailed to load external entity "http://api.census.gov/data/2012/acs1/variables.xml"
Error: 1: No such file or directory2: failed to load external entity "http://api.census.gov/data/2012/acs1/variables.xml"
Execution halted