b4i build error

Hello everyone, i've done this before and i remember giving me the same headache only this time i can't even build the B4iBridge, i get the following error, even though i've followed Erel's tutorials to the letter, i've deleted and re-created the mobile provision file, the certificate file like...

My b4i-bridge can provide the IP address and my laptop can also detect the address. However, the bridge kept loading after I click the address in device IP address. I've deleted the bridge and reinstalled for several times but didn't work tho.

Hi, im new at b4i. i've local mac and already b4ibuildserver running with port 51041. the xcode version is 9.2. b4i is 4.81 iget this error