# Error : PVRTexToolCLI : File does not contain a valid CIL image

**URL:** <https://forums.imgtec.com/t/error-pvrtextoolcli-file-does-not-contain-a-valid-cil-image/2563>\
**Category:** PowerVR Insider\
**Tags:** faq, pvrtextool\
**Created:** [November 21, 2017, 9:21am UTC](https://forums.imgtec.com/t/error-pvrtextoolcli-file-does-not-contain-a-valid-cil-image/2563 "2017-11-21T09:21:19Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![babaroga](https://avatars.discourse-cdn.com/v4/letter/b/ce7236/32.png) [@babaroga](https://forums.imgtec.com/u/babaroga)\
**Post date:** [November 21, 2017, 9:21am UTC](https://forums.imgtec.com/t/error-pvrtextoolcli-file-does-not-contain-a-valid-cil-image/2563/1 "2017-11-21T09:21:19Z")

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Hello,

I am trying to run a toolchain on Mac using mono. The toolchain includes PVRTexToolCLI.exe which ran just fine until Sierra OSX upgrade.

After the upgrade, i am getting this error “Cannot open assembly ‘…/tools/PVRTexTool/CLI/Windows\_x86\_32/PVRTexToolCLI.exe’: File does not contain a valid CIL image.”

Any help would be highly appreciated