Invalid length for a Base-64 char array

Invalid length for a Base-64 char array

  
in my extensions started giving an error.

appears "Invalid length for a Base-64 char array" or "Invalid character in a Base-64 string"

appears in many extensions, for example appear in "
Decrypt"

ERROR:

Message:
Invalid length for a Base-64 char array.
Stack:
at System.Convert.FromBase64String(String s)
at OutSystems.NssCrypto.CssCrypto.MssDecrypt(String ssCipherText, String ssPassword, String& ssClearText)
at ssAutoBlog.RssExtensionCrypto.MssDecrypt(HeContext heContext, String inParamCipherText, String inParamPassword, String& outParamClearText)

can anyone help?
perhaps you can check this: http://stackoverflow.com/questions/858761/what-causing-this-invalid-length-for-a-base-64-char-array


There are some answers which may be applicable to your case.