Overview:
When trying to process data files for Analytics the following error followed by a text string is being generated: Error:Invalid utf8 character string:.
Root Cause:
This is a data issue with the file itself. It is not properly encoded or contains invalid characters.
Solution:
Review the data file for invalid characters using a text editor such as Notepad ++.
Related Documentation:
CRM Help Documentation: Transferring Sales Data Files via FTP