Sorry, that problem must be caused by the wp download.
Please make sure, that the directory modules/ exists in .../plugins/wp-ticker/. Also it should contain a file called Troller.php.
If not, please create the directory "modules". After doing so, go to wp-ticker's download page http://wp-ticker.stegasoft.de/downloads/. There you'll find a link called "Troller runterladen". Download "Troller", rename the file to "Troller.php" and put it in the directory modules.
I think that should resolve your problem.
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sgt on "[Plugin: WP-Ticker] Error after installation"
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