help loop [Loop end must be scalar]

 Hi, someone could help me with this error in my script:
 data=addfile("pgbhnl.gdas.2000010912.grb2", "r") data1=addfile("pgbhnl.gdas.2000011512.grb2", "r") cas1=data->TMP_P0_L100_GLL0({500},:,:) cas2=data1->TMP_P0_L100_GLL0({500},:,:)
 x=0 do i=cas1, cas2,1 s=x+i end do
fatal:Loop end must be scalar, can't execute loopfatal:Loop variable must be scalar, can't execute loopfatal:["Execute.c":8126]:Execute: Error occurred at or near line 7

Thanks

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Received on Wed Apr 24 16:24:04 2013