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Error installing "Seminar" extention

Posted: Sun Jan 02, 2011 11:46 pm
by 2alonsoa
Hi, I am getting an error every time I try and install the "Seminar" extension for my Joomla site. It says

"Unknown Archive Type" and then on a second line, "Unable to find install package". I've tried to install the original program, and the English version, and both times I get the same errors. If someone could help, and soon, that would be amazing. Thanks so much!