Title: Error on Submit
Last modified: August 3, 2017

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# Error on Submit

 *  Resolved [jtodd777](https://wordpress.org/support/users/jtodd777/)
 * (@jtodd777)
 * [8 years, 9 months ago](https://wordpress.org/support/topic/error-on-submit-9/)
 * I am using Ninja Forms v3.1.8
 * I am now getting an error on my form when a user submits. It was working for 
   a month or so.
 * Here is the error (I did remove sensitive data with # and websitename):
 *     ```
       The server encountered an error during processing.
        Uncaught Error: Class 'NF_ESO_Parser' not found in /homepages/14/######/htdocs/clickandbuilds/websitename/wp-content/plugins/ninja-forms/includes/Libraries/EOS/Parser.php:151
       Stack trace:
       #0 /homepages/14/######/htdocs/clickandbuilds/websitename/wp-content/plugins/ninja-forms/includes/Libraries/EOS/Parser.php(377): NF_EOS_Parser->checkInfix(NULL)
       #1 /homepages/14/######/htdocs/clickandbuilds/websitename/wp-content/plugins/ninja-forms/includes/Libraries/EOS/Parser.php(357): NF_EOS_Parser->solveIF(NULL, NULL)
       #2 /homepages/14/######/htdocs/clickandbuilds/websitename/wp-content/plugins/ninja-forms/includes/MergeTags/Calcs.php(31): NF_EOS_Parser->solve('')
       #3 /homepages/14/######/htdocs/clickandbuilds/websitename/wp-content/plugins/ninja-forms/includes/AJAX/Controllers/Submission.php(234): NF_MergeTags_Calcs->set_merge_tags('', '', '2', '.', ',')
       #4 /homepages/14/######/htdocs/clickandbuilds/websitename/wp-content/plugins/ninja-forms/includes/AJAX/Controllers/Submission.php(60): NF_AJAX_Controllers_Submission->process(
       ```
   
 * I don’t really know much PHP so I could really use some help!
    Thanks.
    -  This topic was modified 8 years, 9 months ago by [jtodd777](https://wordpress.org/support/users/jtodd777/).

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

 *  [rebrah](https://wordpress.org/support/users/rebrah/)
 * (@rebrah)
 * [8 years, 9 months ago](https://wordpress.org/support/topic/error-on-submit-9/#post-9379354)
 * I also encountered the above error.
 * Issue is in EOS\Parser.php line 151
 * `throw new Exception("No Equation given", NF_ESO_Parser::E_NO_EQ);`
 * Should be
 * `throw new Exception("No Equation given", NF_EOS_Parser::E_NO_EQ);`
 *  Plugin Contributor [Zach Skaggs](https://wordpress.org/support/users/wpnzach/)
 * (@wpnzach)
 * [8 years, 9 months ago](https://wordpress.org/support/topic/error-on-submit-9/#post-9380658)
 * We will be pushing out a fix for this later today, but in the meantime this likely
   means that you have a calculation on your form that is empty. You can resolve
   the problem by going to “Advanced” in the form builder, then to “Calculations”
   and deleting the empty calculation.

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

The topic ‘Error on Submit’ is closed to new replies.

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 * 2 replies
 * 3 participants
 * Last reply from: [Zach Skaggs](https://wordpress.org/support/users/wpnzach/)
 * Last activity: [8 years, 9 months ago](https://wordpress.org/support/topic/error-on-submit-9/#post-9380658)
 * Status: resolved