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Visual Fortran 157 error Access Violation

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In TUFLOW FV, I am trying to use

Read Grid Zpts == ......\<file>.asc

command to fetch elevation from a large (100GB) ASCII grid. I am using the 2019 x64 build of TUFLOW FV.

After closing the file unit, the program is crashing with a Visual Fortran 157 error - Access Violation. I have read/write access to the folder where the ASCII grid resides.

Can anyone help?



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