***WARNING - Instability at Joints

Im new to STAAD and I could not figure out why STAAD gives ***WARNING - Instability at Joints. For some reason staad gives me 0 Errors, 54 Warnings, 55 Notes.

Can anyone please help?

Thank you very much :)

and here is my output file:

STAAD SPACE DXF IMPORT OF CAD.DXF
START JOB INFORMATION
ENGINEER DATE 21-Feb-17
END JOB INFORMATION
INPUT WIDTH 79
UNIT METER KN
JOINT COORDINATES
1 0 7 -3; 2 4 7 -3; 3 0 7 -7; 4 4 7 -7; 5 0 7 -10; 6 4 7 -10; 7 4 7 0; 8 8 7 0;
9 12 7 0; 10 8 7 -3; 11 12 7 -3; 12 16 7 -3; 13 8 7 -7; 14 12 7 -7; 15 16 7 -7;
16 8 7 -10; 17 12 7 -10; 18 16 7 -10; 19 0 4 0; 20 4 4 0; 21 0 4 -3; 22 4 4 -3;
23 0 4 -7; 24 4 4 -7; 25 0 4 -10; 26 4 4 -10; 27 8 4 0; 28 12 4 0; 29 16 4 0;
30 8 4 -3; 31 12 4 -3; 32 16 4 -3; 33 8 4 -7; 34 12 4 -7; 35 16 4 -7;
36 8 4 -10; 37 12 4 -10; 38 16 4 -10; 39 0 0 0; 40 4 0 0; 41 8 0 0; 42 12 0 0;
43 16 0 0; 44 0 0 -3; 45 4 0 -3; 46 8 0 -3; 47 12 0 -3; 48 16 0 -3; 49 0 0 -7;
50 4 0 -7; 51 8 0 -7; 52 12 0 -7; 53 16 0 -7; 54 0 0 -10; 55 4 0 -10;
56 8 0 -10; 57 12 0 -10; 58 16 0 -10; 59 16.0398 4 -3; 60 16.0398 7 -3;
61 16.0398 4 -7; 62 16.0398 7 -7; 63 16.0398 4 -10; 64 16.0398 7 -10;
MEMBER INCIDENCES
1 1 2; 2 3 4; 3 5 6; 4 7 8; 5 8 9; 6 2 10; 7 10 11; 8 11 12; 9 4 13; 10 13 14;
11 14 15; 12 6 16; 13 16 17; 14 17 18; 15 7 2; 16 1 3; 17 2 4; 18 3 5; 19 4 6;
20 8 10; 21 10 13; 22 13 16; 23 9 11; 24 11 14; 25 14 17; 26 12 15; 27 15 18;
28 19 20; 29 21 22; 30 23 24; 31 25 26; 32 20 27; 33 27 28; 34 28 29; 35 22 30;
36 30 31; 37 31 32; 38 24 33; 39 33 34; 40 34 35; 41 26 36; 42 36 37; 43 37 38;
44 19 21; 45 20 22; 46 21 23; 47 22 24; 48 23 25; 49 24 26; 50 27 30; 51 30 33;
52 33 36; 53 28 31; 54 31 34; 55 34 37; 56 29 32; 57 32 35; 58 35 38; 59 39 19;
60 40 20; 61 41 27; 62 42 28; 63 43 29; 64 44 21; 65 45 22; 66 46 30; 67 47 31;
68 48 32; 69 49 23; 70 50 24; 71 51 33; 72 52 34; 73 53 35; 74 54 25; 75 55 26;
76 56 36; 77 57 37; 78 58 38; 79 20 7; 80 27 8; 81 28 9; 82 21 1; 83 22 2;
84 30 10; 85 31 11; 86 59 60; 87 23 3; 88 24 4; 89 33 13; 90 34 14; 91 61 62;
92 25 5; 93 26 6; 94 36 16; 95 37 17; 96 63 64;
START GROUP DEFINITION
FLOOR
_2F1 28 TO 30 32 35 38 41 44 TO 47 49 TO 52
_2F2 33 34 36 37 39 40 42 43 50 TO 58
_ROOF 1 TO 27
END GROUP DEFINITION
DEFINE MATERIAL START
ISOTROPIC CONCRETE
E 2.17185e+007
POISSON 0.17
DENSITY 23.5616
ALPHA 1e-005
DAMP 0.05
TYPE CONCRETE
STRENGTH FCU 27579
END DEFINE MATERIAL
MEMBER PROPERTY AMERICAN
1 TO 58 PRIS YD 0.5 ZD 0.3
59 TO 96 PRIS YD 0.3 ZD 0.3
CONSTANTS
MATERIAL CONCRETE ALL
SUPPORTS
39 TO 58 PINNED
SLAVE ZX MASTER 33 JOINT 19 TO 32 34 TO 38
SLAVE ZX MASTER 13 JOINT 1 TO 6 11 12 14 TO 18
DEFINE UBC LOAD
ZONE 0.4 I 1 RWX 8.5 RWZ 8.5 STYP 5 NA 1 NV 1
SELFWEIGHT 1
MEMBER WEIGHT
28 31 TO 34 41 TO 44 46 48 56 TO 58 UNI 13
38 TO 40 47 49 51 UNI 9.9
FLOOR WEIGHT
_2F1 FLOAD 5
_2F2 FLOAD 5
_ROOF FLOAD 3
LOAD 1 LOADTYPE Seismic TITLE EQX
UBC LOAD X 1
PERFORM ANALYSIS
CHANGE
LOAD 2 LOADTYPE Seismic TITLE EQZ
UBC LOAD Z 1
PERFORM ANALYSIS
CHANGE
LOAD 3 LOADTYPE Dead TITLE DL
SELFWEIGHT Y -1
MEMBER LOAD
28 31 TO 34 41 TO 44 46 48 56 TO 58 UNI GY -13
38 TO 40 47 49 51 UNI GY -9.9
FLOOR LOAD
_2F1 FLOAD -5 GY
_2F2 FLOAD -5 GY
_ROOF FLOAD -3 GY
LOAD 4 LOADTYPE Live TITLE LL
FLOOR LOAD
_2F1 FLOAD -2.4 GY
_2F2 FLOAD -4.8 GY
LOAD COMB 5 1.2DL + 1.6LL
3 1.2 4 1.6
LOAD COMB 6 1.2DL + 1.0LL + 1EQX+
3 1.2 4 1.0 1 1.0
LOAD COMB 7 1.2DL + 1.0LL + 1EQX-
3 1.2 4 1.0 1 -1.0
LOAD COMB 8 1.2DL + 1.0LL + 1EQZ+
3 1.2 4 1.0 1 1.0
LOAD COMB 9 1.2DL + 1.0LL + 1EQZ-
3 1.2 4 1.0 1 -1.0
PERFORM ANALYSIS
FINISH

Hoping for a response :)