This error may occur when backing up or closing your data file, if the file name is excessively long or if the file path exceeds 250 characters.
To resolve this issue, make sure your data file is saved to the following location (if not, move it there):
If your file already resides in the above location, shorten the file name by renaming it to 8 characters or less. Avoid using <* ? | " : \ / > in the file name.
Note: If you're not sure of the location of your data file, see Finding Quicken files.