Build issues

signature conflict

pack:
  [echo] Pack200'ing jar files in 'jars'
  [apply] Exception in thread "main" java.lang.SecurityException: Invalid signature file digest for Manifest main attributes
  [apply] 	at sun.security.util.SignatureFileVerifier.processImpl(SignatureFileVerifier.java:330)
  [apply] 	at sun.security.util.SignatureFileVerifier.process(SignatureFileVerifier.java:263)
  [apply] 	at java.util.jar.JarVerifier.processEntry(JarVerifier.java:275)
  [apply] 	at java.util.jar.JarVerifier.update(JarVerifier.java:230)
  [apply] 	at java.util.jar.JarFile.initializeVerifier(JarFile.java:383)
  [apply] 	at java.util.jar.JarFile.getInputStream(JarFile.java:450)
  [apply] 	at com.sun.java.util.jar.pack.PackerImpl$DoPack$InFile.getInputStream(PackerImpl.java:392)
  [apply] 	at com.sun.java.util.jar.pack.PackerImpl$DoPack.run(PackerImpl.java:480)
  [apply] 	at com.sun.java.util.jar.pack.PackerImpl.pack(PackerImpl.java:100)
  [apply] 	at com.sun.java.util.jar.pack.Driver.main(Driver.java:313)
  [apply] Result: 1

The JAR files in EXIST_HOME are already signed with a (different) certificate. Please unsign these JAR files first.