Adding participants problem

@Muhammad_Tayyab wrote:

I get following error whenever I click on Add Participants button:
GET https://ifrnd.org/journal/index.php/jebs/$$$call$$$/grid/users/user-select/user-select-grid/fetch-grid?submissionId=1550&stageId=1&_=1488804610124 406 (Not Acceptable)

I checked for PHP error log and I got this:
PHP Fatal error: Call to a member function getId() on a non-object in /**my_journal_path**/pages/article/ArticleHandler.inc.php on line 76

May be related to this problem, I am also getting these warnings even after disabling "RecommendedbyAuthor" plugin
PHP Warning: array_merge(): Argument #2 is not an array in /**my_journal_path**/lib/pkp/classes/core/PKPApplication.inc.php on line 578
PHP Warning: Invalid argument supplied for foreach() in /**my_journal_path**/plugins/generic/recommendByAuthor/RecommendByAuthorPlugin.inc.php on line 114

Chrome
OJS 3.0.2
PHP 5.4.43

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