I am using twenty eleven for a wordpress blog natashaart.net.
What ever plugin I try to add, as soon as I activate it I get the following messages:
Notice: Undefined variable: value_name in /home2/pawlinuc/public_html/natasha/wp-content/plugins/simple-basic-contact-form/simple-basic-contact-form.php on line 42
Notice: Undefined variable: value_email in /home2/pawlinuc/public_html/natasha/wp-content/plugins/simple-basic-contact-form/simple-basic-contact-form.php on line 43
Notice: Undefined variable: value_response in /home2/pawlinuc/public_html/natasha/wp-content/plugins/simple-basic-contact-form/simple-basic-contact-form.php on line 44
Notice: Undefined variable: value_message in /home2/pawlinuc/public_html/natasha/wp-content/plugins/simple-basic-contact-form/simple-basic-contact-form.php on line 45
I put up the problem on the WordPress forum and was advised to use another form, which did work, see http://wordpress.org/support/topic/cannot-install-any-plugins-1?replies=3#post-3709682