If you get an error like this when you execute gradle build, it means that there is something wrong with your maven repository priority (just an example):
Checksum missing at http://www.systap.com/maven/releases/org/semanticweb/yars/nxparser/1.2.3/nxparser-1.2.3.pom.sha1 due to: For input string: "<!"
Download http://www.systap.com/maven/releases/org/semanticweb/yars/nxparser/1.2.3/nxparser-1.2.3.pom
[Fatal...
Maven repository priority in Gradle