RE: staad warning

Hi Kaushal, i am having the same problem. I am practicing designing a 12m span beam, with a rectangular section 400m x 700m. i am just a beginner when it comes to using this software. please help. here's my staad output:

STAAD SPACE
START JOB INFORMATION
ENGINEER DATE 09-May-17
END JOB INFORMATION
INPUT WIDTH 79
UNIT METER KN
JOINT COORDINATES
1 0 0 0; 2 12 0 0;
MEMBER INCIDENCES
1 1 2;
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 PRIS YD 0.7 ZD 0.4
CONSTANTS
MATERIAL CONCRETE ALL
SUPPORTS
1 2 FIXED
LOAD 1 LOADTYPE Dead TITLE DL
SELFWEIGHT Y -1
MEMBER LOAD
1 CON GY -86.215
LOAD 2 LOADTYPE Live TITLE LL
MEMBER LOAD
1 CON GY -13.4
LOAD COMB 3 1.4DL+1.7LL
1 1.4 2 1.7
PERFORM ANALYSIS
START CONCRETE DESIGN
CODE ACI
FYMAIN 275000 ALL
MAXMAIN 25 ALL
MINMAIN 25 ALL
DESIGN BEAM 1
CONCRETE TAKE
FC 20700 ALL
END CONCRETE DESIGN
FINISH