Title: First Argument Error?
Last modified: August 19, 2016

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# First Argument Error?

 *  [Bobby Clapp](https://wordpress.org/support/users/dgodfather/)
 * (@dgodfather)
 * [15 years, 3 months ago](https://wordpress.org/support/topic/first-argument-error/)
 * On a multisite network install I get the following after activation.
 * Warning: call_user_func_array() [function.call-user-func-array]: First argument
   is expected to be a valid callback, ‘Array’ was given in …/wp-includes/plugin.
   php on line 395
 * Warning: call_user_func_array() [function.call-user-func-array]: First argument
   is expected to be a valid callback, ‘Array’ was given in …/wp-includes/plugin.
   php on line 395

Viewing 7 replies - 1 through 7 (of 7 total)

 *  Thread Starter [Bobby Clapp](https://wordpress.org/support/users/dgodfather/)
 * (@dgodfather)
 * [15 years, 3 months ago](https://wordpress.org/support/topic/first-argument-error/#post-1943067)
 * Is this a plugin issue or wordpress issue?
 *  [Curtiss Grymala](https://wordpress.org/support/users/cgrymala/)
 * (@cgrymala)
 * [15 years, 3 months ago](https://wordpress.org/support/topic/first-argument-error/#post-1943068)
 * More than likely it’s a plugin issue.
 * Start by switching to Twenty Ten theme (if you’re not already using that).
 * Then deactivate all of your plugins and see if the problem persists. If not, 
   reactivate each plugin one-by-one until the problem resurfaces. If the problem
   doesn’t resurface with all of your plugins reactivated, switch back to your theme
   and see if the problem pops back up again.
 *  Thread Starter [Bobby Clapp](https://wordpress.org/support/users/dgodfather/)
 * (@dgodfather)
 * [15 years, 3 months ago](https://wordpress.org/support/topic/first-argument-error/#post-1943069)
 * Weird, this post was associated with a plugin (more fields). What I didn’t understand
   if the plugin was bad or if my wordpress installation didn’t like it.
 *  [Andrea Rennick](https://wordpress.org/support/users/andrea_r/)
 * (@andrea_r)
 * [15 years, 3 months ago](https://wordpress.org/support/topic/first-argument-error/#post-1943070)
 * Probably the plugin has no knowledge or check for anything multisite, whether
   or not it needs it.
 * Sometimes there’s a small coding error in a plugin that just isn’t revealed until
   the network is activated.
 *  Moderator [Ipstenu (Mika Epstein)](https://wordpress.org/support/users/ipstenu/)
 * (@ipstenu)
 * 🏳️‍🌈 Advisor and Activist
 * [15 years, 3 months ago](https://wordpress.org/support/topic/first-argument-error/#post-1943074)
 * The plugin MAY still work if you activate it PER site (i.e. NOT network activated).
 *  Thread Starter [Bobby Clapp](https://wordpress.org/support/users/dgodfather/)
 * (@dgodfather)
 * [15 years, 3 months ago](https://wordpress.org/support/topic/first-argument-error/#post-1943075)
 * Activating it on a single network site also gives the same error. I suppose I’ll
   have to wait for an update or learn PHP real quick. haha
 *  [Andrea Rennick](https://wordpress.org/support/users/andrea_r/)
 * (@andrea_r)
 * [15 years, 3 months ago](https://wordpress.org/support/topic/first-argument-error/#post-1943077)
 * Or find a substitute, yep. 🙂

Viewing 7 replies - 1 through 7 (of 7 total)

The topic ‘First Argument Error?’ is closed to new replies.

 * In: [Networking WordPress](https://wordpress.org/support/forum/multisite/)
 * 7 replies
 * 4 participants
 * Last reply from: [Andrea Rennick](https://wordpress.org/support/users/andrea_r/)
 * Last activity: [15 years, 3 months ago](https://wordpress.org/support/topic/first-argument-error/#post-1943077)
 * Status: not resolved

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