MEMBER TENSION - urgent help

PLEASE I AM HAVING  PROBLEM WITH MY X-BRACING SYSTEM. i'm planning to set my cross bracing to member tension only. in my model I have 43 load cases for other analysis but the one that corresponds to my X-bracing is from load case 20 to 25.

my question, how would I set - -  SET NL   command under member tension for my corresponding load cases?

at the moment, after my frame analysis, an error occur with UNEXPECTED COMMAND. below is what I have as error

NOTE - TENSION/COMPRESSION COVERGED AFTER 1 ITERATIONS, CASE = 1

NOTE - TENSION/COMPRESSION COVERGED AFTER 1 ITERATIONS, CASE = 2

READSX IREC ,N           2                    2256

subr errord          j=         36