If you receive an error when using a tab-delimited text file, check that your files are formatted correctly. If a tab-delimited text file is formatted incorrectly, the results are unpredictable. The error explanations list possible causes of errors. See Use tab-delimited text files for more information
Check the tab-delimited file to determine whether you have extra carriage returns or tabs. Check the referenced files to ensure that all files are referenced exactly in the tab-delimited text file.
Check that you do not have a file open in another program, such as Microsoft Excel or Notepad. You may have the tab-delimited text file open in a text editing program or you may have a graphic file open in a graphic-file editing program. Close all files involved in the addition before retrying.
When you finish adding multiple compound objects, the first compound object in the Add list becomes the base set. The fields mapped in that compound object must echo the mapping in all other compound objects in the Add list. If not, you will see this message. If you proceed with the process, you may also see file does not exist errors due to improper mapping, as described above. Delete all files that do not have the same field mapping as the first file.
The information in the first record of the tab-delimited text file does not match expectations. Check that the tab-delimited text file is formatted correctly.