I sorted it out. I tried removing the Lua 5.1 linked library from the build path and then re-added the LuaDoc. I think it was a conflict between the previous definitions of Lua's API and the LÖVE LuaDoc's definitions.

I just updated the luadoc to v0.8.0 for LDT. Get the .zip and add it as external lib to your project to get documentation and auto-completion. https://github.com/mkosler/LOVELuaDoc Hmm Cant seem it get that to work.... The files need to be in the root level of the zip, but github delivers the files...