Can craft excavators but when trying to switch to them in the hotbar, game crashes.

Crash Report - https://pastebin.com/ENEfKtQB

Only way to get back into the server once this has happened is to delete the playerdata file thus clearing inventory.

1.1.0 is for 1.15. 1.2.0 was recently released with 1.16 support. Thanks for the report!