Dont worry about the error, E11 is illegal hall state and as you have no motor connected you would get that or 04 which is Motor Overtemp.
You may have to try and find what the port needs to be set to, you can get the software to attempt that, go to Tools menu then Recover Comms and follow the instructions.
If you still dont get it working make sure your serial cable has cross over between pins 2 and 3.
Hood