Error in dev_w9 directory

Dear Experts

Please solve my problem in my production server dev_w9 (Trace file)shows some errors and I tried more but I did not get solution and after I posted here so please reply anyone who have already faced this problem and who knows about this problem

ERROR : RFC-GUI :thsendandwait in read returned :27 [abrfcsys.c 6920]

ERROR : RFC Error RFCIO_ERROR_SYSERROR in abrfcsys.c :6925

ERROR : RFC Error RFCIO_ERROR_Message in abrfcio.c :1833

Regards