DATA SHOULD FOLLOW AFTER CONSTANT COMMAND AND NOT ANY OTHER TYPE OF COMMAND. DATA-CHECK MODE ENTERED.

I'm designing this RC beam bridge per AASHTO LRFD specifications. It is designed for HL-93. I have created my model but everytime I run my analysis, I keep getting the subject error message. I am fairly new to STAAD so I've no clue what am I doing wrong to trigger that error. Any help is greatly appreciated. 

Here's my input:

STAAD SPACE
START JOB INFORMATION
ENGINEER DATE 28-Jun-17
END JOB INFORMATION
INPUT WIDTH 79
UNIT FEET KIP
JOINT COORDINATES
1 0 0 0; 2 20 0 0; 3 20 0 4; 4 20 0 8; 5 20 0 12; 6 20 0 16; 7 0 0 4;
8 0 0 8; 9 0 0 12; 10 0 0 16; 11 20 0 5;
MEMBER INCIDENCES
1 1 2; 2 7 3; 3 8 4; 4 9 5; 5 10 6;
DEFINE MATERIAL START
ISOTROPIC CONCRETE
E 453600
POISSON 0.17
DENSITY 0.150336
ALPHA 5e-006
DAMP 0.05
TYPE CONCRETE
G 193846
TYPE CONCRETE
STRENGTH FCU 576
STRENGTH FCU 576
END DEFINE MATERIAL
MEMBER PROPERTY
1 TO 5 PRIS YD 1.04167 ZD 4
CONSTANTS
SUPPORTS
1 7 TO 10 PINNED
2 TO 6 ENFORCED BUT FX MX MZ
DEFINE MOVING LOAD
TYPE 1 HS20 1
TYPE 2 H20 1
TYPE 3 LOAD 25 25
DIST 4 WID 6
LOAD GENERATION 200
TYPE 1 0 0 6.5 XINC 0.1
TYPE 2 0 0 6.5 XINC 0.1
TYPE 3 0 0 6.5 XINC 0.1
LOAD 201 LOADTYPE Dead TITLE DL
SELFWEIGHT Y -1 LIST ALL
LOAD 202 LOADTYPE Dead TITLE Lane Load
MEMBER LOAD
1 TO 5 UNI GY -0.0533 0 20
LOAD COMB 203 COMBINATION Dead and Lane
201 1.0 202 1.0
PERFORM ANALYSIS PRINT ALL
PERFORM ANALYSIS PRINT ALL
PERFORM ANALYSIS PRINT ALL
PERFORM ANALYSIS PRINT ALL
PERFORM ANALYSIS
DEFINE ENVELOPE
201 202 ENVELOPE 1 TYPE STRENGTH
END DEFINE ENVELOPE
PERFORM DIRECT ANALYSIS
FINISH