I am on the latest build of flans on 1.12.2 and can't craft some of the parts in the simple parts pack. pls help

We are sorry but we are unable to help you.
Please verify you are using the latest content packs and FlansMod jar. If the issue persists it is recommended to use a fresh Minecraft, Forge and FlansMod installation to rule out any outdated or faulty jars and/or configuration files
Please also verify you are following these steps to install FlansMod, if not note the differences to your process

If you still encounter issues please refer to
https://github.com/FlansMods/FlansMod/wiki/Issue-Reporting

I have tried a new forge installation forge-1.12.2-14.23.5.2847 and reinstalled flans, deleted the config and content pack and got the latest ones from github. everything runs except that I can't craft certain items like the light tank body and heavy body

@xSLUMA What specific version of Flan's mod are you trying?
I was able to craft a light tank body with v5.6-beta.7

What other mods do you have installed? My guess is that you have Quark installed which causes compatibility problems: https://github.com/FlansMods/FlansMod/wiki/1.12.2-Mods-compatibility-list