Error when trying to delete metadata from images (Linux .deb install and AppImage)

This is the error:

Unhandled Promise Rejection
Error: Exiftool process is not open
    at ExiftoolProcess.close (/opt/ExifCleaner/resources/app.asar/node_modules/node-exiftool/src/index.js:33:35)
    at file:///opt/ExifCleaner/resources/app.asar/webpack:/src/common/add_files.js:23:6
    at file:///opt/ExifCleaner/resources/app.asar/webpack:/src/common/add_files.js:22:8