IllegalStateException when opening AssetPackBrowser

Error Message: “Cannot find TopComponent with preferredID null”

I’m using Windwos 7 64 bit andMonkeyEngine SDK 3.0RC2.
I did also enter username and password under Asset Packs options.

In RC2 or nightly? What do you do exactly? The null is strange, sounds like some of your settings are messed up, try renaming your settings folder to test it:

Renaming the settings folder C:\Users\Mathias\AppData\Roaming.jmonkeyplatform\3.0RC2 solved this problem.
I don’t know what caused this error message… however it’s working now.

Thank You

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