Hi Team, I had manually installed the latest version of snpEff based on the recommendation of Pablo and after modifying the XML files I had a working version of snpEff that produced a vcf. However, this morning I reran my workflow and it is failing again, but this time I am getting the following error: Fatal error: Exit code 1 (Error) Exception in thread "main" java.lang.UnsupportedClassVersionError: ca/mcgill/mcb/pcingola/snpEffect/commandLine/SnpEff : Unsupported major.minor version 51.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:643) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at java.net.URLClassLoader.defineClass(URLClassLoader.java:277) at java.net.URLClassLoader.access$000(URLClassLoader.java:73) at java.net.URLClassLoader$1.run(URLClassLoader.java:212) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:205) at java.lang.ClassLoader.loadClass(ClassLoader.java:323) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294) at java.lang.ClassLoader.loadClass(ClassLoader.java:268) Could not find the main class: ca.mcgill.mcb.pcingola.snpEffect.commandLine.SnpEff. Program will exit. Nothing has been changed since I had success. Regards, Iry The information in this email, including attachments, may be confidential and is intended solely for the addressee(s). If you believe you received this email by mistake, please notify the sender by return email as soon as possible.