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I'm using PSE 10 (and 9) and added Lightroom 4 as a new program.
I linked PSE 10 as external editor like shown in http://tv.adobe.com/de/watch/von-photoshop-elements-zu-lightroom-wechseln/elements-als-ext ernen-editor-in-lightroom-nutzen-/ (german).
Unexpected error performing command:
bad argument #1 to 'lower' (string expected, got nil)
So, what's wrong?