![OJS 3.1.2] PKP PN Plugin error - Failed Ajax request or invalid JSON returned [close] - Software Support - PKP Community Forum OJS 3.1.2] PKP PN Plugin error - Failed Ajax request or invalid JSON returned [close] - Software Support - PKP Community Forum](https://forum.pkp.sfu.ca/uploads/default/original/3X/9/4/94b6f1cdafe457e7e6bf9a915b4a4a47b5eb3fa5.png)
OJS 3.1.2] PKP PN Plugin error - Failed Ajax request or invalid JSON returned [close] - Software Support - PKP Community Forum
![How to diagnose a 500 Internal Server Error on IIS 7.5 when nothing is written to the event log? - Server Fault How to diagnose a 500 Internal Server Error on IIS 7.5 when nothing is written to the event log? - Server Fault](https://i.stack.imgur.com/9D0mw.png)
How to diagnose a 500 Internal Server Error on IIS 7.5 when nothing is written to the event log? - Server Fault
![Workaround: Proxied HTTP requests fail due to HTTP 500 error: NullPointerException - Library: Articles - Jazz Community Site Workaround: Proxied HTTP requests fail due to HTTP 500 error: NullPointerException - Library: Articles - Jazz Community Site](https://jazz.net/library-content/wp-content/uploads/2012/11/widget.png)
Workaround: Proxied HTTP requests fail due to HTTP 500 error: NullPointerException - Library: Articles - Jazz Community Site
![Ajax call with a failed to load resource: the server response with a status 500 (internal server error) - Stack Overflow Ajax call with a failed to load resource: the server response with a status 500 (internal server error) - Stack Overflow](https://i.stack.imgur.com/SpMne.png)
Ajax call with a failed to load resource: the server response with a status 500 (internal server error) - Stack Overflow
![Failed to load resource: the server responded with a status of 500 (Internal Server Error) through wp_admin_ajax.php - WordPress Development Stack Exchange Failed to load resource: the server responded with a status of 500 (Internal Server Error) through wp_admin_ajax.php - WordPress Development Stack Exchange](https://i.stack.imgur.com/KaY00.jpg)
Failed to load resource: the server responded with a status of 500 (Internal Server Error) through wp_admin_ajax.php - WordPress Development Stack Exchange
jsdebug issue for webservice call from ajax - NetworkError: 500 Internal Server Error - DotNetMirror
![500 Internal Server Error when POSTing image to directus_files · Issue #2025 · directus/directus · GitHub 500 Internal Server Error when POSTing image to directus_files · Issue #2025 · directus/directus · GitHub](https://user-images.githubusercontent.com/26255529/34832589-8521c706-f6e2-11e7-889d-cdbd8e50af45.png)