File assembly name, ClxAct7lists or one of its dependencies, was not found

Symptom:
- Error message: 'File assembly name, ClxAct7lists or one of its dependencies, was not found'.
- Synching direct.
- Using CompanionLink 2.0, build 2554.

Fix:
- Download and install CompanionLink 2.0, build 2555 or higher.

OR

- Copy clxact7lists.dll from c:\Program Files\CompanionLink to c:\Program Files\Microsoft ActiveSync.