Here's the exception in forge.log

12:36:58,630 SEVERE [org.jboss.forge.addon.shell.aesh.CommandAdapter] (AeshProcess: 1) Failed to execute [picketlink-setup] due to exception.: java.lang.RuntimeException: Could not load type.
at org.picketlink.tools.forge.operations.AttributedTypeOperations.getAttributedTypes(AttributedTypeOperations.java:80)
at org.picketlink.tools.forge.operations.ConfigurationOperationsImpl.createIdentityManagementConfiguration(ConfigurationOperationsImpl.java:142)
at org.picketlink.tools.forge.operations.ConfigurationOperationsImpl.newIdentityManagementConfiguration(ConfigurationOperationsImpl.java:64)
at org.picketlink.tools.forge.ui.idm.JPAIdentityStoreSetupWizardStep.execute(JPAIdentityStoreSetupWizardStep.java:65)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.7.0_51]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) [rt.jar:1.7.0_51]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.7.0_51]
at java.lang.reflect.Method.invoke(Method.java:606) [rt.jar:1.7.0_51]
at org.jboss.forge.furnace.proxy.ClassLoaderInterceptor$1.call(ClassLoaderInterceptor.java:87) [furnace-proxy-2.8.0.Final.jar:2.8.0.Final]
at org.jboss.forge.furnace.util.ClassLoaders.executeIn(ClassLoaders.java:40) [furnace-api-2.8.0.Final.jar:2.8.0.Final]
at org.jboss.forge.furnace.proxy.ClassLoaderInterceptor.invoke(ClassLoaderInterceptor.java:103) [furnace-proxy-2.8.0.Final.jar:2.8.0.Final]
at org.picketlink.tools.forge.ui.idm.JPAIdentityStoreSetupWizardStep_$$javassist_b72bfa3d-afdc-4c63-a18b-0b70cc81fc6e.execute(JPAIdentityStoreSetupWizardStep$$_javassist_b72bfa3d-afdc-4c63-a18b-0b70cc81fc6e.java)
at org.jboss.forge.addon.ui.impl.controller.WizardCommandControllerImpl.execute(WizardCommandControllerImpl.java:153) [ui-impl-2.8.0.Final.jar:2.8.0.Final]
at org.jboss.forge.addon.ui.impl.controller.NoUIWizardControllerDecorator.execute(NoUIWizardControllerDecorator.java:152) [ui-impl-2.8.0.Final.jar:2.8.0.Final]
at org.jboss.forge.addon.shell.aesh.CommandAdapter.execute(CommandAdapter.java:74) [shell-impl-2.8.0.Final.jar:2.8.0.Final]
at org.jboss.aesh.console.AeshConsoleImpl$AeshConsoleCallbackImpl.execute(AeshConsoleImpl.java:325) [aesh-0.56.jar:0.56]
at org.jboss.aesh.console.AeshProcess.run(AeshProcess.java:40) [aesh-0.56.jar:0.56]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_51]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_51]
at java.lang.Thread.run(Thread.java:744) [rt.jar:1.7.0_51]
Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range: -1
at java.lang.String.substring(String.java:1871) [rt.jar:1.7.0_51]
at org.picketlink.tools.forge.operations.AttributedTypeOperations$1.visitFile(AttributedTypeOperations.java:116)
at org.picketlink.tools.forge.operations.AttributedTypeOperations$1.visitFile(AttributedTypeOperations.java:102)
at java.nio.file.FileTreeWalker.walk(FileTreeWalker.java:135) [rt.jar:1.7.0_51]
at java.nio.file.FileTreeWalker.walk(FileTreeWalker.java:199) [rt.jar:1.7.0_51]
at java.nio.file.FileTreeWalker.walk(FileTreeWalker.java:199) [rt.jar:1.7.0_51]
at java.nio.file.FileTreeWalker.walk(FileTreeWalker.java:69) [rt.jar:1.7.0_51]
at java.nio.file.Files.walkFileTree(Files.java:2600) [rt.jar:1.7.0_51]
at java.nio.file.Files.walkFileTree(Files.java:2633) [rt.jar:1.7.0_51]
at org.picketlink.tools.forge.operations.AttributedTypeOperations.findAttributedTypes(AttributedTypeOperations.java:102)
at org.picketlink.tools.forge.operations.AttributedTypeOperations.getAttributedTypes(AttributedTypeOperations.java:78)
... 19 more

12:36:58,645 SEVERE [org.jboss.forge.addon.shell.aesh.CommandAdapter] (AeshProcess: 1) Could not load type.: java.lang.RuntimeException: Could not load type.
at org.picketlink.tools.forge.operations.AttributedTypeOperations.getAttributedTypes(AttributedTypeOperations.java:80)
at org.picketlink.tools.forge.operations.ConfigurationOperationsImpl.createIdentityManagementConfiguration(ConfigurationOperationsImpl.java:142)
at org.picketlink.tools.forge.operations.ConfigurationOperationsImpl.newIdentityManagementConfiguration(ConfigurationOperationsImpl.java:64)
at org.picketlink.tools.forge.ui.idm.JPAIdentityStoreSetupWizardStep.execute(JPAIdentityStoreSetupWizardStep.java:65)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.7.0_51]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) [rt.jar:1.7.0_51]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.7.0_51]
at java.lang.reflect.Method.invoke(Method.java:606) [rt.jar:1.7.0_51]
at org.jboss.forge.furnace.proxy.ClassLoaderInterceptor$1.call(ClassLoaderInterceptor.java:87) [furnace-proxy-2.8.0.Final.jar:2.8.0.Final]
at org.jboss.forge.furnace.util.ClassLoaders.executeIn(ClassLoaders.java:40) [furnace-api-2.8.0.Final.jar:2.8.0.Final]
at org.jboss.forge.furnace.proxy.ClassLoaderInterceptor.invoke(ClassLoaderInterceptor.java:103) [furnace-proxy-2.8.0.Final.jar:2.8.0.Final]
at org.picketlink.tools.forge.ui.idm.JPAIdentityStoreSetupWizardStep_$$javassist_b72bfa3d-afdc-4c63-a18b-0b70cc81fc6e.execute(JPAIdentityStoreSetupWizardStep$$_javassist_b72bfa3d-afdc-4c63-a18b-0b70cc81fc6e.java)
at org.jboss.forge.addon.ui.impl.controller.WizardCommandControllerImpl.execute(WizardCommandControllerImpl.java:153) [ui-impl-2.8.0.Final.jar:2.8.0.Final]
at org.jboss.forge.addon.ui.impl.controller.NoUIWizardControllerDecorator.execute(NoUIWizardControllerDecorator.java:152) [ui-impl-2.8.0.Final.jar:2.8.0.Final]
at org.jboss.forge.addon.shell.aesh.CommandAdapter.execute(CommandAdapter.java:74) [shell-impl-2.8.0.Final.jar:2.8.0.Final]
at org.jboss.aesh.console.AeshConsoleImpl$AeshConsoleCallbackImpl.execute(AeshConsoleImpl.java:325) [aesh-0.56.jar:0.56]
at org.jboss.aesh.console.AeshProcess.run(AeshProcess.java:40) [aesh-0.56.jar:0.56]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_51]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_51]
at java.lang.Thread.run(Thread.java:744) [rt.jar:1.7.0_51]
Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range: -1
at java.lang.String.substring(String.java:1871) [rt.jar:1.7.0_51]
at org.picketlink.tools.forge.operations.AttributedTypeOperations$1.visitFile(AttributedTypeOperations.java:116)
at org.picketlink.tools.forge.operations.AttributedTypeOperations$1.visitFile(AttributedTypeOperations.java:102)
at java.nio.file.FileTreeWalker.walk(FileTreeWalker.java:135) [rt.jar:1.7.0_51]
at java.nio.file.FileTreeWalker.walk(FileTreeWalker.java:199) [rt.jar:1.7.0_51]
at java.nio.file.FileTreeWalker.walk(FileTreeWalker.java:199) [rt.jar:1.7.0_51]
at java.nio.file.FileTreeWalker.walk(FileTreeWalker.java:69) [rt.jar:1.7.0_51]
at java.nio.file.Files.walkFileTree(Files.java:2600) [rt.jar:1.7.0_51]
at java.nio.file.Files.walkFileTree(Files.java:2633) [rt.jar:1.7.0_51]
at org.picketlink.tools.forge.operations.AttributedTypeOperations.findAttributedTypes(AttributedTypeOperations.java:102)
at org.picketlink.tools.forge.operations.AttributedTypeOperations.getAttributedTypes(AttributedTypeOperations.java:78)
... 19 more