Vox chops on pads missing - search wont accept correct file

Loaded up a project I have been working on, where I have an acapella chopped up into short phrases which were mapped across groove agent SE and written in as midi. Everything was working fine, and I haven’t renamed or moved the acapella file being referenced by groove agent.

When i loaded it up today, it said the acapella was missing, and came up with the search to find it window. When I select the correct file in the project folder’s audio folder, the search window will not accept this as the file and still displays missing.

Other projects with a chopped up vox in the same way load fine.

I have tried renaming the file and selecting the new name but this still didn’t work.

Has anyone come across this problem?

Any ideas appreciated.