What issue are you having? Incompatible mod set. It is saying I need version 2001.1.1-build.219 instead of 2001.1.1-build.1 for FTB Library only has an alpha version available for build.1 and no build ...
to recreate the issue install Flow and FTB library (fabric) on minecraft version 1.21.1 on fabric version 0.16.9 start a world and break any block then open inventory you will see a blank GUI ...
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