build failure

Hi I downloaded the source and built in netbeans where i get this error JAVA-EXCEPTION: Java exception 'java.lang.NoSuchMethodException: No applicable method named getURLs found in java.lang.ClassLoader or jdk.internal.loader.ClassLoaders$AppClassLoader'. C:\git\abcl\etc\ant\netbeans-build.xml:15: The following error occurred while executing this line: C:\git\abcl\build.xml:280: The following error occurred while executing this line: C:\git\abcl\build.xml:299: Java returned: -1 BUILD FAILED (total time: 13 seconds) Can you help? Thanks stephen