why tie-member-40 fail in attached input file???

STAAD SPACE
START JOB INFORMATION
ENGINEER DATE 3/14/2018
JOB NAME SPBD
JOB CLIENT TOSHIBA JSW POWER SYSTEMS PRIVATE LIMITED
JOB NO C-2314
JOB REV 00
JOB PART TYPE-K8
ENGINEER NAME DINESH
CHECKER NAME DINESH
CHECKER DATE 3/14/2018
END JOB INFORMATION
INPUT WIDTH 79
UNIT METER KG
JOINT COORDINATES
10 5.00001 -6.23001 0; 14 5.00001 1.67 0; 15 7.30001 1.67 0;
16 5.00001 -0.00500339 0; 17 7.30001 -0.00500339 0; 18 7.00001 -0.00500339 0;
19 5.00001 -2.00501 0; 20 8.40002 -0.00500339 0; 21 5.00001 -6.23001 1.6;
22 5.00001 -2.00501 1.6; 23 5.00001 -0.00500339 1.6; 24 5.00001 1.67 1.6;
25 7.30001 1.67 1.6; 26 7.00001 -0.00500339 1.6; 27 7.30001 -0.00500339 1.6;
28 8.40002 -0.00500339 1.6; 29 5.00001 -4.22951 0; 30 5.00001 -4.22951 1.6;
MEMBER INCIDENCES
15 10 29; 16 16 14; 17 14 15; 18 16 18; 19 15 17; 20 18 17; 21 19 16; 22 18 19;
23 17 20; 24 21 30; 25 23 24; 26 24 25; 27 23 26; 28 25 27; 29 26 27; 30 22 23;
31 26 22; 32 27 28; 33 29 19; 34 30 22; 35 29 30; 38 14 24; 39 25 15; 40 19 22;
DEFINE MATERIAL START
ISOTROPIC STEEL
E 2.03889e+010
POISSON 0.3
DENSITY 7833.37
ALPHA 6e-006
DAMP 0.03
TYPE STEEL
STRENGTH FY 2.53104e+007 FU 4.07779e+007 RY 1.5 RT 1.2
END DEFINE MATERIAL
MEMBER PROPERTY INDIAN
15 16 21 24 25 30 33 34 TABLE FR ISMC150 SP 0.1
17 22 26 31 39 TABLE ST ISMB200
18 TO 20 23 27 TO 29 32 TABLE ST ISMC150
35 38 40 TABLE ST ISMB150
CONSTANTS
BETA 90 MEMB 15 16 21 24 25 30 33 34
MATERIAL STEEL ALL
SUPPORTS
10 21 FIXED
DEFINE 1893 LOAD
ZONE 0.24 RF 5 I 1.5 SS 2 ST 2 DM 0.05
MEMBER WEIGHT
17 CON 297 0.396
39 CON 297 0.8
23 32 CON 297 0.596
DEFINE WIND LOAD
TYPE 1 WIND 1
INT 155 HEIG 10
EXP 1 JOINT 10 14 TO 30
***********************************************************************
LOAD 1 LOADTYPE Seismic TITLE EQ X
1893 LOAD X 1
PERFORM ANALYSIS
CHANGE
***********************************************************************
LOAD 2 LOADTYPE Seismic TITLE EQ-X
1893 LOAD X -1
PERFORM ANALYSIS
CHANGE
***********************************************************************
LOAD 3 LOADTYPE Seismic TITLE EQZ
1893 LOAD Z 1
PERFORM ANALYSIS
CHANGE
***********************************************************************
LOAD 4 LOADTYPE Seismic TITLE EQ-Z
1893 LOAD Z -1
PERFORM ANALYSIS
CHANGE
***********************************************************************
LOAD 5 LOADTYPE Dead TITLE DL
SELFWEIGHT Y -1 LIST 15 TO 35 38 39
MEMBER LOAD
17 CON GY -297 0.396
39 CON GY -297 0.8
23 32 CON GY -150 0.596
***********************************************************************
LOAD 6 LOADTYPE Live REDUCIBLE TITLE LL
MEMBER LOAD
38 CON GY -100 0
***********************************************************************
LOAD 7 LOADTYPE Wind TITLE WLX
WIND LOAD X 1 TYPE 1 YR 0 10 OPEN
MEMBER LOAD
17 CON GX 115 0.396
***********************************************************************
LOAD 8 LOADTYPE Wind TITLE WL-X
WIND LOAD -X -1 TYPE 1 YR 0 10 OPEN
MEMBER LOAD
17 CON GX -115 0.396
***********************************************************************
LOAD 9 LOADTYPE Wind TITLE WLZ
WIND LOAD Z 1 TYPE 1 YR 0 10 OPEN
MEMBER LOAD
39 CON GZ 115 0.8
***********************************************************************
LOAD 10 LOADTYPE Wind TITLE WL-Z
WIND LOAD X -1 TYPE 1 YR 0 10 OPEN
MEMBER LOAD
39 CON GZ -115 0.8
***********************************************************************
LOAD 11 LOADTYPE Accidental TITLE SCF
MEMBER LOAD
17 CMOM GZ 652 0.396
39 CMOM GX 652 0.8
******************************************************
*****************************************
**-----FACTORED LOAD COMBINATIONS (SEC. 203.3.1)---------
***
LOAD COMB 101 1.5DL
5 1.5
LOAD COMB 102 1.5DL+1.5LL
5 1.5 6 1.5
LOAD COMB 103 1.5DL+1.5WLX
5 1.5 7 1.5
LOAD COMB 104 1.5DL+1.5WL-X
5 1.5 8 1.5
LOAD COMB 105 1.5DL+1.5WLZ
5 1.5 9 1.5
LOAD COMB 106 1.5DL+1.5WL-Z
5 1.5 10 1.5
LOAD COMB 107 1.0DL+1.0SCF
5 1.0 11 1.0
LOAD COMB 108 1.2DL+1.2LL+0.6WL-X
5 1.2 6 1.2 8 0.6
LOAD COMB 109 1.2DL+1.2LL+0.6WL-Z
5 1.2 6 1.2 10 0.6
LOAD COMB 110 1.0DL+1.0WLX+1.0SCF
5 1.0 7 1.0 11 1.0
LOAD COMB 111 1.0DL+1.0WLZ+1.0SCF
5 1.0 9 1.0 11 1.0
LOAD COMB 112 1.2DL+1.2EQ+X
5 1.2 1 1.2
LOAD COMB 113 1.2DL+1.2EQ-X
5 1.2 2 1.2
LOAD COMB 114 1.2DL+1.2EQ+Z
5 1.2 3 1.2
LOAD COMB 115 1.2DL+1.2EQ-Z
5 1.2 4 1.2
*********************************************
**-----SERVICE LOAD COMBINATIONS (SEC. 203.4.2) ---------
***
LOAD COMB 201 1.0DL
5 1.0
LOAD COMB 202 1.0DL+1.0LL
5 1.0 6 1.0
LOAD COMB 203 1.0DL+0.8WLX
5 1.0 7 0.8
LOAD COMB 204 1.0DL+0.8WL-X
5 1.0 8 0.8
LOAD COMB 205 1.0DL+0.8WLZ
5 1.0 9 0.8
LOAD COMB 206 1.0DL+0.85WL-Z
5 1.0 10 0.8
LOAD COMB 207 1.0DL+1.0SCF
5 1.0 11 1.0
LOAD COMB 208 1.0DL+0.8LL+0.8WL-X
5 1.0 6 0.8 8 0.8
LOAD COMB 209 1.0DL+0.8LL+0.8WL-Z
5 1.0 6 0.8 10 0.8
LOAD COMB 210 1.0DL+0.8WLX+0.8SCF
5 1.0 7 0.8 11 0.8
LOAD COMB 211 1.0DL+0.8WLZ+0.8SCF
5 1.0 9 0.8 11 0.8
LOAD COMB 212 1.0DL+0.8EQ+X
5 1.0 1 0.8
LOAD COMB 213 1.0DL+0.8EQ-X
5 1.0 2 0.8
LOAD COMB 214 1.0DL+0.8EQ+Z
5 1.0 3 0.8
LOAD COMB 215 1.0DL+0.8EQ-Z
5 1.0 4 0.8
********************************************************************
PERFORM ANALYSIS
DEFINE ENVELOPE
101 TO 115 ENVELOPE 1 TYPE STRENGTH
201 TO 215 ENVELOPE 2 TYPE SERVICEABILITY
END DEFINE ENVELOPE
LOAD LIST ENV 1 2
********************************************************************
PARAMETER 1
CODE IS800 LSD
BEAM 1 ALL
DFF 240 ALL
LY 2.2 MEMB 15 16 21 24 25 30 33 34
LZ 2.2 MEMB 15 16 21 24 25 30 33 34
MAIN 180 MEMB 15 16 21 24 25 30 33 34
TRACK 1 ALL
CHECK CODE ALL
FINISH