error on tk103

Hi all, trying to set a tk103 I get this error....

2019-03-26 15:20:14  INFO: [a1430395: 5001 < 181.117.220.150] HEX: 78780d010352887076286354003b8a470d0a
2019-03-26 15:20:14  WARN: [a1430395] error - begin 21, end 23, length 14 - StringIndexOutOfBoundsException (... < Gps103ProtocolDecoder:411 < ExtendedObjectDecoder:51 < ... < WrapperContext:102 < ...)
2019-03-26 15:20:14  WARN: [a1430395] error - begin 21, end 23, length 4 - StringIndexOutOfBoundsException (... < Gps103ProtocolDecoder:411 < ExtendedObjectDecoder:51 < ... < WrapperContext:102 < ...)
2019-03-26 15:20:14  INFO: [a1430395] disconnected

any clue?
how to know if is a tk103B or TK103 ?
regards,

The clue is here:

https://www.traccar.org/clones/

Your device is using GT06 protocol, so correct port is 5023.

Anton,
I have the same error: WARN: [592dd2b2] error - begin 21, end 23, length 14 - ............

is there a way to discover the IMEI of " [592dd2b2] connection" to correct the port?

JB