I have had also the same problem as @mwerschy and never solved it.. I just updated it right now once again

gradle wrapper --gradle-distribution-url https://repo.gradle.org/gradle/dist-snapshots/gradle-script-kotlin-4.0-20170420024736+0000-bin.zip

but it worked only partially,

buildscript

and

apply

now are not shown as error, but everything else is, such as

repositories

inside

builscript