Can someone tell me the error in the following staad code. For background - smaller 3.5 ft WT member are supposed to be cantilevers that's why only My released.

STAAD SPACE
START JOB INFORMATION
ENGINEER DATE 04-Apr-18
END JOB INFORMATION
INPUT WIDTH 79
UNIT FEET KIP
JOINT COORDINATES
1 0 0 0; 2 1.67 0 0; 3 19.66 0 0; 4 21.33 0 0; 5 1.67 -6.5 0; 6 19.66 -6.5 0;
7 0.29 0 0; 8 5.33 0 0; 9 10.67 0 0; 10 16 0 0; 11 21.04 0 0; 12 0.29 0 3.67;
13 0.29 0 -3.67; 14 5.33 0 3.67; 15 5.33 0 -3.67; 16 10.67 0 3.67;
17 10.67 0 -3.67; 18 16 0 3.67; 19 16 0 -3.67; 20 21.04 0 3.67;
21 21.04 0 -3.67;
MEMBER INCIDENCES
1 1 7; 2 2 5; 3 3 6; 4 7 12; 5 8 14; 6 9 16; 7 10 18; 8 11 20; 9 7 13; 10 8 15;
11 9 17; 12 10 19; 13 11 21; 14 2 8; 15 3 11; 16 7 2; 17 8 9; 18 9 10; 19 10 3;
20 11 4; 21 12 14; 22 14 16; 23 16 18; 24 18 20; 25 13 15; 26 15 17; 27 17 19;
28 19 21;
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 14 TO 20 TABLE ST W10X33
2 3 TABLE ST W8X35
MEMBER PROPERTY AMERICAN
4 TO 13 PRIS YD 0.6675 ZD 0.5833 YB 0.6254 ZB 0.0254
MEMBER PROPERTY AMERICAN
21 TO 28 TABLE ST HSST4X2X0.375
CONSTANTS
MATERIAL STEEL ALL
SUPPORTS
5 6 FIXED
MEMBER RELEASE
4 TO 13 20 START MY
21 TO 28 START MY MZ
21 TO 28 END MY MZ
1 END MY
LOAD 1 LOADTYPE Dead TITLE DL
SELFWEIGHT Y -1
MEMBER LOAD
*Load of Channel
21 TO 28 UNI GY -0.02
*10psf Load of deck plus misc on trib 5.34
5 TO 7 10 TO 12 UNI GY -0.0534
*10psf Load of deck plus misc on trib 2.7
4 8 9 13 UNI GY -0.027
PERFORM ANALYSIS
FINISH