From the Kotaku post reporting on the issue
One user said he contacted Xbox Live Support, which provided the following steps for addressing the issue. "It worked for me," he said.
1. Delete all GTAV game data.
2. Clear system cache three times.
3. Delete marketplace data from storage system items.
4. Unplug console for three minutes.
5. Install disc 1.
6. Power off, do not insert disc 2.
8. Install disc 2.
This may or maynot fix it for some people. I have not tried.