Error in sort.list(y) : invalid input 'some characater types' in 'utf8towcs'

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Create OAut session
2. Define query$Init() parameters
3. Run ga$GetReportsData(query)

What is the expected output? What do you see instead?
I have successfully run the code numerous times on parameters that contain user 
comments, sometimes receiving Chinese characters which is fine. When changing 
the date parameters I sometimes get the exception error:
'Error in sort.list(y) : invalid input 'some non-Latin characters here' in 
'utf8towcs'

What version of the product are you using? On what operating system?
RGoogleAnalytics V 0.1.1
Windows 7 Enterprise SP 1

Please provide any additional information below.

Original issue reported on code.google.com by JP.Gorma...@gmail.com on 24 Sep 2014 at 2:21