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This bug was originally marked as duplicate of bug 250951, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 8.1 Beta (Build 201508041349) VM: Java HotSpot(TM) Client VM, 25.31-b07, Java(TM) SE Runtime Environment, 1.8.0_31-b13 OS: Windows 7 User Comments: GUEST: Install Python plugin from the previous version and re-open Stacktrace: java.lang.AssertionError: Python_2.6.6 at org.netbeans.modules.python.project.gsf.BootClassPathImplementation.getUrls(BootClassPathImplementation.java:128) at org.netbeans.modules.python.project.gsf.BootClassPathImplementation.getResources(BootClassPathImplementation.java:82) at org.netbeans.modules.java.classpath.ProxyClassPathImplementation.getResources(ProxyClassPathImplementation.java:94) at org.netbeans.api.java.classpath.ClassPath.entries(ClassPath.java:369) at org.netbeans.modules.parsing.impl.indexing.PathRegistry.createResources(PathRegistry.java:741) at org.netbeans.modules.parsing.impl.indexing.PathRegistry.getSources(PathRegistry.java:297)
Created attachment 156118 [details] stacktrace
Unfortunately, it would appear you attempted to use the OLD Python plugin (version 0.107) with NetBeans IDE 8.1 Beta or from Development. Use of the OLD Python plugin is NOT supported. Please make sure you install the Python plugin from the DEVELOPMENT Update Center, or install at least version 0.150812 Thank you from the folks at nbpython.org