How to deal with Findbugs error "Classfile header isn't 0xCAFEBABE in"

Hello,
After upgrade Sonarqube server to version 6.7.4 and its compatible Findbugs plugin v.3.7 we get next error during the Sonar check:
Caused by: edu.umd.cs.findbugs.classfile.InvalidClassFileFormatException: Classfile header isn’t 0xCAFEBABE in ClassName.class

How can we get rid of this error?