The error Error: Input Line at 0 > Max Chars of ### means that there are more characters per line then allowed in the data file.
Steps to fix:
1.) Open the data file producing this error and determine how many characters are in each line.
2.) Open the map in uCompose and go to the Options tab and click Preferences.
3.) Set the Max Characters per line: to the correct character limit.
4.) Save the map and resubmit the submission.