This errors may happen when you are running a db2cluster command, and you specify incorrect parameter(s). Plz check the db2cluster command issued around of the time of errors.
For example, I did a simple test in my test environment
db2cluster -clear -alert -member1 where option '-member1' is not correct. 2016-03-03-00.11.51.765281-240 E1961A383 LEVEL: Error PID : 61931750 TID : 1 PROC : db2cluster INSTANCE: ad920634 NODE : 000 HOSTNAME: db2debug EDUID : 1 FUNCTION: DB2 UDB, high avail services, sqlhaUIParseCmdArgs, probe:4447 RETCODE : ECF=0x90000531=-1879046863=ECF_SQLHA_INVALID_PARAM Invalid parameter to SQLHA call 2016-03-03-00.11.51.765873-240 E2345A374 LEVEL: Error PID : 61931750 TID : 1 PROC : db2cluster INSTANCE: ad920634 NODE : 000 HOSTNAME: db2debug EDUID : 1 FUNCTION: DB2 UDB, high avail services, sqlhaUIMain, probe:400 MESSAGE : ECF=0x90000531=-1879046863=ECF_SQLHA_INVALID_PARAM Invalid parameter to SQLHA call