Problem with transit heat transfer analysis

[xuefengshi]

I am doing transit heat transfer analysis and met the problem below. Appreciate if anybody could explain for me. Thanks.

forrtl: severe (9): permission to access file denied, unit 27, file C:\FEA\HeatTrans.ds_data\1\ds.t27
Image              PC                Routine            Line        Source            
srun11.exe         0000000140464D08  Unknown               Unknown  Unknown
srun11.exe         000000014045FBD9  Unknown               Unknown  Unknown
srun11.exe         000000014041E33D  Unknown               Unknown  Unknown
srun11.exe         00000001404020E7  Unknown               Unknown  Unknown
srun11.exe         00000001404019B1  Unknown               Unknown  Unknown
srun11.exe         00000001403EF9FF  Unknown               Unknown  Unknown
srun11.exe         000000014012FBEE  ITFILL                    227  iolib.for
srun11.exe         00000001401757C4  MODSTM                    221  modstm.for
srun11.exe         0000000140080C49  STLSTP                   1150  stlstp2.for
srun11.exe         000000014014F561  TSTEP                     611  tstep.for
srun11.exe         00000001400AF2D4  FMAIN                    1378  ssap11h.for
srun11.exe         000000014015F716  MAIN__                    363  halloc11.for
srun11.exe         000000014048BECC  Unknown               Unknown  Unknown
srun11.exe         0000000140449A2F  Unknown               Unknown  Unknown
kernel32.dll       0000000076F3652D  Unknown               Unknown  Unknown
ntdll.dll          000000007706C541  Unknown               Unknown  Unknown