Addon - Installation Failed SBO 9.3 PL04

Hi experts,

When try to install any lightweight addon - when running SBO client(registered in extension manager) i get error - Installation failed.

No matter if i complie to 9.3 or use old one(9.2).

Anyone had same problem and found any solution?

I checked it on 3 diferent 9.3 server installations and alwayes same error.

SBO 9.3 PL 04