Execution failed for task ':assetCompile'. with Grails3

[Andreas Weber]

Cannot cast object '[Digest Input Stream] MD5 Message Digest from SUN,
' with class 'java.security.DigestInputStream' to class 'java.io.ByteArrayInputStream'

This project compiled fine with Grails2, what do I need to check ? I have not referenced any .map files afaik

before, I'm hitting this

grails/grails-spring-security-ui#37

no idea if its related, but its a problem with asset-pipeline aswell