Error in input file: not well-formed (invalid token): line 1, column 1

This error message indicates that there is an issue with the structure of the input file that you are trying to read or parse. Specifically, the file contains an invalid token at the beginning of the first line, which prevents it from being considered "well-formed" XML or another structured format.

To resolve this issue, you will need to carefully review the input file and look for any syntax errors or formatting issues that may be causing the problem. Common causes of this error include missing or mismatched tags, incorrect indentation, or unexpected characters that may have been introduced during file transfer or editing.

Once you have identified and corrected the issue, you should be able to successfully parse or read the input file without encountering any further errors. If you continue to experience problems, you may need to consult the documentation or support resources for the software or tool that you are using to work with the file.