Hi Delia,
What is your the result for you when running
svn --version
on the console?
It seems that the problem is on AkPlugin/AkPluginManager.php method canUseSvn(). Can you try to find out and tell us why it can't execute the command correctly?
Besides weird error, if you update your working copy and add in your config/development.php
define('AK_BEST_PLUGIN_INSTALL_METHOD', 'http');
You should have no problems installing plugins by using simple http instead of svn.
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