Trouble importing Photoshop File on Toon Boom Harmony

I’ve been trying for days to import a file image that I’ve made in Photoshop into Toon Boom Harmony Premium, but instead a small window pops up that says something like 'unable to read /Users/scottrosas/Library/Application Support/ToonBoomSessionTempDir/612/elements/2.d/d-4.psd”

Please explain a solution for this issue. Thanks.