Attached, Screen shot of Error Message:

Cannot get to Upload
++++++++++++++++++++++++++++

Stack trace for jAlbum 39.6 using skin PhotoBlogger 7.5.1:

se.datadosen.util.ScriptException: C:\Users\brian\AppData\Roaming\JAlbum\skins\PhotoBlogger\lib\util.js:3535 TypeError: null has no such function "iterator" in content.inc at line number 5
at se.datadosen.util.ScriptException.of(ScriptException.java:59)
at se.datadosen.jalbum.ast.ScriptletNode.doEval(ScriptletNode.java:99)
at se.datadosen.jalbum.ast.ASTNode.eval(ASTNode.java:50)
at se.datadosen.jalbum.ast.GroupNode.doEval(GroupNode.java:78)
at se.datadosen.jalbum.ast.IncludeNode.doEval(IncludeNode.java:89)
at se.datadosen.jalbum.ast.ASTNode.eval(ASTNode.java:50)
at se.datadosen.jalbum.ast.GroupNode.doEval(GroupNode.java:78)
at se.datadosen.jalbum.ast.EnterNode.doEval(EnterNode.java:23)
at se.datadosen.jalbum.ast.ASTNode.eval(ASTNode.java:50)
at se.datadosen.jalbum.ast.GroupNode.doEval(GroupNode.java:78)
at se.datadosen.jalbum.ast.ASTNode.eval(ASTNode.java:50)
at se.datadosen.jalbum.AST.eval(AST.java:75)
at se.datadosen.jalbum.AlbumBean.makeIndexPages(AlbumBean.java:4483)
at se.datadosen.jalbum.AlbumBean.makeAlbumForFolder(AlbumBean.java:2001)
at se.datadosen.jalbum.AlbumBean.makeAlbum(AlbumBean.java:3952)
at se.datadosen.jalbum.AlbumBean.smartMakeAlbum(AlbumBean.java:3788)
at se.datadosen.jalbum.MakeAlbumTask.doInBackground(MakeAlbumTask.java:185)
at se.datadosen.jalbum.TaskManager$BackgroundTask.call(TaskManager.java:111)
at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)
Caused by: javax.script.ScriptException: TypeError: null has no such function "iterator" in C:\Users\brian\AppData\Roaming\JAlbum\skins\PhotoBlogger\lib\util.js at line number 3535
at org.openjdk.nashorn.api.scripting.NashornScriptEngine.throwAsScriptException(NashornScriptEngine.java:436)
at org.openjdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:420)
at org.openjdk.nashorn.api.scripting.NashornScriptEngine$1.eval(NashornScriptEngine.java:476)
at java.scripting/javax.script.CompiledScript.eval(Unknown Source)
at se.datadosen.jalbum.ast.ScriptletNode.doEval(ScriptletNode.java:67)
... 20 more
Caused by: C:\Users\brian\AppData\Roaming\JAlbum\skins\PhotoBlogger\lib\util.js:3535 TypeError: null has no such function "iterator"
at org.openjdk.nashorn.internal.runtime.ECMAErrors.error(ECMAErrors.java:57)
at org.openjdk.nashorn.internal.runtime.ECMAErrors.typeError(ECMAErrors.java:212)
at org.openjdk.nashorn.internal.runtime.ECMAErrors.typeError(ECMAErrors.java:184)
at org.openjdk.nashorn.internal.runtime.ECMAErrors.typeError(ECMAErrors.java:171)
at org.openjdk.nashorn.internal.runtime.linker.NashornBottomLinker.linkNull(NashornBottomLinker.java:258)
at org.openjdk.nashorn.internal.runtime.linker.NashornBottomLinker.getGuardedInvocation(NashornBottomLinker.java:69)
at jdk.dynalink/jdk.dynalink.linker.support.CompositeGuardingDynamicLinker.getGuardedInvocation(Unknown Source)
at jdk.dynalink/jdk.dynalink.LinkerServicesImpl.lambda$getGuardedInvocation$0(Unknown Source)
at jdk.dynalink/jdk.dynalink.LinkerServicesImpl.getWithLookupInternal(Unknown Source)
at jdk.dynalink/jdk.dynalink.LinkerServicesImpl.getGuardedInvocation(Unknown Source)
at jdk.dynalink/jdk.dynalink.DynamicLinker.relink(Unknown Source)
at org.openjdk.nashorn.internal.scripts.Script$Recompilation$442$87427AAIZA$util.getChildrenOfType(C:\Users\brian\AppData\Roaming\JAlbum\skins\PhotoBlogger\lib\util.js:3535)
at org.openjdk.nashorn.internal.scripts.Script$Recompilation$441$112625AIAZAA$util.getRandomChildren(C:\Users\brian\AppData\Roaming\JAlbum\skins\PhotoBlogger\lib\util.js:4576)
at org.openjdk.nashorn.internal.scripts.Script$Recompilation$440$1179AA$\^eval\_.getMosaic(<eval>:42)
at org.openjdk.nashorn.internal.scripts.Script$437$\^eval\_.:program(<eval>:170)
at org.openjdk.nashorn.internal.runtime.ScriptFunctionData.invoke(ScriptFunctionData.java:646)
at org.openjdk.nashorn.internal.runtime.ScriptFunction.invoke(ScriptFunction.java:506)
at org.openjdk.nashorn.internal.runtime.ScriptRuntime.apply(ScriptRuntime.java:519)
at org.openjdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:415)
... 23 more

One more thing. It might be the contents custom page that triggers the error. It is supposed to work, but there could be corner cases. For example, a folder that contains only an external link or something similar, where jAlbum returns an invalid response when the skin asks for the folder's contents.