Unlike a simple "file not found" error (which is usually Error 7 or 14), Error 108 suggests that the file exists in the directory, but the application cannot parse it. This is often due to:

Ensure you are signed into the or Apple App Store with the exact same ID used to make the original purchase. iGO licenses are strictly tied to the platform account. 2. Clear App Cache (Android Only)

Reviewers and forum participants describe the error as "tedious" because it effectively locks them out of maps or premium features they have already paid for. Official Status: Developer NNG LLC acknowledges the error in their Naviextras Knowledge Base