error CS0246: The type or namespace name 'BurstCompile' could not be found

Hi
When I start a new projekt I get this error 7 times plus many mores, I dont know how to fix it!

error CS0246: The type or namespace name ‘BurstCompile’ could not be found (are you missing a using directive or an assembly reference?)

See if the Burst package is installed in the Package Manager. If it is, then check if Unity.Burst is referenced in any Assembly Definition References (see this GIF and this Manual page).