1. Verify that the file is saved with a .csv extension
2. Create a new csv file and copy over the data to it from the original csv file to ascertain if the issue with the original file becoming corrupt. If the new csv file works with no error, then that indicates there is an issue with the original csv file.
3. Create a new folder on the computer and copy over the csv to that new folder and try the import again, many times there can be issues with permissions and\or other issues with the containing folder that can cause FIMS to view the csv file as non-valid.
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