New Post: Issue Player: Bad signature

Hi, our old C1 site cannot display newly added PDF docs in IssuePlayer. Old docs have no problem. I think the newer files couldn't be uploaded.

Site version:

Composite C1 3.2 Patch 4
Build no. 3.2.4813.16821

Error:

Error: 011: Bad signature
C1 Function: Composite.Media.IssuuPlayer
Error details:
Failed to execute function with local name 'GetDocument'
Failed to get value for function 'Composite.Media.IssuuPlayer.GetDocument'
Özel durum bir çağırma hedefi tarafından oluşturuldu.
011: Bad signature

How can I fix this?