Cannot update project from project metafile (Error 1909)

There is a conflict in the project metafile (.PJM file).

• You edited the .PJM file directly.

  Restore the file to a previous version and use the interface to make changes: undo the checkout of the .PJM file and update the project list.

• There is a conflict in the project information section of the .PJM file.

  Resolve the conflict by removing complete lines only, if possible.

• The formatting in the project metafile is incorrect.

  For example, some information has an unexpected data type, or commas are misplaced.