I got the following error when trying to install jevents on Joomla! version, 3.4.1.

See attached screenshot. I get this same error on some of the other extensions I've tried to install. I don't know how to fix this error. Thanks for any ideas you can suggest.[attachment=0:1y2omj8l]<!-- ia0 -->jeventserror.jpg<!-- ia0 -->[/attachment:1y2omj8l]