2019.1.0b7 requires LWRP package version 5.6.1, while this sample project lwrp branch is currently set to package version 4.8.0-preview and editor 2018.3.0f2.
found with master branch commit 32ada6ac176295e0a58a2e8558f8c60577a03711
and lwrp_support branch commit df0c4c0908d2bc7118c61e17d0fbe560b42d476d (after fixing the include errors)
It would be great to update the lwrp support branch to work with 2019
agreed
ARFoundation 3.0 provides much improved support for LWRP/Universal RP. Step-by-step instructions can be found here.
Most helpful comment
It would be great to update the lwrp support branch to work with 2019