Title: Error code
Last modified: August 22, 2016

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# Error code

 *  [Partychemicals](https://wordpress.org/support/users/partychemicals/)
 * (@partychemicals)
 * [11 years, 4 months ago](https://wordpress.org/support/topic/error-code-38/)
 * Hello
    I installed newest version of WP Pipes in my WP site. I use WP RSS-multi
   importer to import rss feeds. InWPPipes Requirements settings everything is green
   for full function. Available sources/destinations to select from are only post
   and RSS reader.
 * Sources output produce no results of any feed or post. Output:
    Fatal error: 
   Call to undefined function mb_strlen() in /home/partyche/public_html/wp/wp-content/
   plugins/wp-pipes/includes/phputf8/mbstring/core.php on line 29
 * [https://wordpress.org/plugins/wp-pipes/](https://wordpress.org/plugins/wp-pipes/)

Viewing 2 replies - 1 through 2 (of 2 total)

 *  [spanhaak](https://wordpress.org/support/users/spanhaak/)
 * (@spanhaak)
 * [11 years, 3 months ago](https://wordpress.org/support/topic/error-code-38/#post-5656903)
 * Could you post a link to a screenshot that shows the settings you have used?
 *  Plugin Contributor [Tung Pham](https://wordpress.org/support/users/phamtungpth/)
 * (@phamtungpth)
 * [11 years, 3 months ago](https://wordpress.org/support/topic/error-code-38/#post-5656914)
 * Hi Partychemicals,
 * That seems your system not allow using mb_strlen function.
 * Please try to check if that function is turned on or off!
 * Regards!

Viewing 2 replies - 1 through 2 (of 2 total)

The topic ‘Error code’ is closed to new replies.

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## Tags

 * [Fatal error: Call to undefined function](https://wordpress.org/support/topic-tag/fatal-error-call-to-undefined-function/)

 * 2 replies
 * 3 participants
 * Last reply from: [Tung Pham](https://wordpress.org/support/users/phamtungpth/)
 * Last activity: [11 years, 3 months ago](https://wordpress.org/support/topic/error-code-38/#post-5656914)
 * Status: not resolved