The differential interferogram export to snapu unwrapping

Did anyone meet the same problem with me?
when i click the export data for snapu unwrapping, i cannot select the target folder.
And if i paste the path into the target folder, it reminds [file] is null.
Then, can anyone help me to fix it?

i encountered the null problem whenever I save the input file to another folder when it is already loaded in SNAP. Perhaps try to verify your input file.

otherwise, manually create your output folder and paste the destination path.