STAAD Composite Steel Beam Error

I am trying to analyze a composite steel beam in STAAD and keep getting an error that says design of section for member is not supported.  Here is my input. 

STAAD SPACE
START JOB INFORMATION
ENGINEER DATE 15-Aug-17
END JOB INFORMATION
INPUT WIDTH 79
UNIT FEET KIP
JOINT COORDINATES
1 0 0 0; 2 20 0 0;
MEMBER INCIDENCES
1 1 2;
DEFINE MATERIAL START
ISOTROPIC STEEL
E 4.176e+006
POISSON 0.3
DENSITY 0.489024
ALPHA 6e-006
DAMP 0.03
TYPE STEEL
STRENGTH FY 5184 FU 8352 RY 1.5 RT 1.2
END DEFINE MATERIAL
MEMBER PROPERTY AMERICAN
1 TABLE CM W12X26 CT 0.333 FC 576 CW 11.5 CD 0.15
CONSTANTS
MATERIAL STEEL ALL
SUPPORTS
1 PINNED
2 FIXED BUT MY MZ
LOAD 1 LOADTYPE Dead TITLE DEAD LOAD
SELFWEIGHT Y -1.05
MEMBER LOAD
1 UNI GY -1
LOAD 2 LOADTYPE Live TITLE LIVE LOAD
MEMBER LOAD
1 UNI GY -1
LOAD COMB 3 GENERATED IBC TABLE1LLFA232 1
1 1.4
LOAD COMB 4 GENERATED IBC TABLE1LLFA232 2
1 1.2 2 1.6
LOAD COMB 5 GENERATED IBC TABLE1LLFA232 3
1 1.2 2 1.0
LOAD COMB 6 GENERATED IBC TABLE1LLFA232 4
1 1.2
LOAD COMB 7 GENERATED IBC TABLE1LLFA232 5
1 0.9
PERFORM ANALYSIS
PARAMETER 1
CODE AISC UNIFIED 2010
BEAM 1 ALL
RBH 0.5 ALL
TRACK 2 ALL
RATIO 1 ALL
METHOD LRFD
FYLD 7200 ALL
FU 9360 ALL
CHECK CODE ALL
FINISH

Please let me know where I have an error.