Title: errors when activating
Last modified: September 13, 2017

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# errors when activating

 *  [iavoo](https://wordpress.org/support/users/iavoo/)
 * (@iavoo)
 * [8 years, 8 months ago](https://wordpress.org/support/topic/errors-when-activating-4/)
 * get all this errors after activation the plugin – Please advise:
 * Warning: call_user_func() expects parameter 1 to be a valid callback, class ‘
   Cherry_Interface_Builder’ does not have a method ‘get_instance’ in ….\wp-content\
   plugins\cherry-services-list\cherry-framework\cherry-core.php on line 299
 * Warning: session_start(): Cannot send session cache limiter – headers already
   sent (output started at H:\wamp64\www\gkc\wp-content\plugins\cherry-services-
   list\cherry-framework\cherry-core.php:299) in ……\wp-content\plugins\cherry-services-
   list\public\includes\class-cherry-services-list-form.php on line 44
 * Warning: call_user_func() expects parameter 1 to be a valid callback, class ‘
   Cherry_Interface_Builder’ does not have a method ‘get_instance’ in …….\wp-content\
   plugins\cherry-services-list\cherry-framework\cherry-core.php on line 299
 * Warning: call_user_func() expects parameter 1 to be a valid callback, class ‘
   Cherry_Interface_Builder’ does not have a method ‘get_instance’ in …….\wp-content\
   plugins\cherry-services-list\cherry-framework\cherry-core.php on line 299
 * Warning: Cannot modify header information – headers already sent by (output started
   at H:\wamp64\www\gkc\wp-content\plugins\cherry-services-list\cherry-framework\
   cherry-core.php:299) in ……\wp-includes\pluggable.php on line 1195
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Ferrors-when-activating-4%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

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 * 0 replies
 * 1 participant
 * Last reply from: [iavoo](https://wordpress.org/support/users/iavoo/)
 * Last activity: [8 years, 8 months ago](https://wordpress.org/support/topic/errors-when-activating-4/)
 * Status: not resolved