5.x Error: Cannot generate thumbnail

Hi,
I'm getting the following error in my Capture One 5.x:

Description: Cannot generate thumbnail from proxy file: too few color profiles
File: /Users/joachimfrey/Desktop/web/CaptureOne/Cache/Proxies/JF_200910__JO29711.CR2.cop
Domain: com.phaseone.captureone
Code: 23


Any ideas?

JO