Hi,
You are getting this error message as the SBO-COMMON version and the client is not at same version.
You can check the client version by doing the following steps :-
1. Right click on the SAP Business One client -->Properties --> Find Target --> Then right click on SAP Business One.exe
file Go to version tab and check the Special build description.
In order to resolve the issue run the client application --> Select the database and then upgrade the client application.
Can you also be more specific with the client and the server version.
Thanks
Rishi Abrol