Error message when testing connection

Hi does anyone knows what does this message means and how to fix it?

com.sap.b1i.xcellerator.XcelleratorException: XCE001 Nested exception: java.lang.Exception: com.sap.b1i.xcellerator.XcelleratorException: XCE001 Nested exception: com.sap.b1i.adapter.dia.FunctionCaller$ConnectionFailedException: Connect to Business One failed.

(-112) Failed to Extract OBServer.dll from CAB File

If there is 2 landscape, for example landscape A1 and B1

When i test connection on the A1, it is successful, but when i try testing connection with B1, it display the error message. Vice versa it is the same.

Any advice?