iisnode encountered an error when processing the request.

HTTP status: 500
HTTP subStatus: 1013
HTTP reason: Internal Server Error

You are receiving this HTTP 200 response because system.webServer/iisnode/@devErrorsEnabled configuration setting is 'true'.

In addition to the log of stdout and stderr of the node.exe process, consider using debugging and ETW traces to further diagnose the problem.

The last 64k of the output generated by the node.exe process to stderr is shown below:

js-bson: Failed to load c++ bson extension, using pure JS version
Warning: connect.session() MemoryStore is not
designed for a production environment, as it will leak
memory, and will not scale past a single process.
Wed, 20 Jun 2018 22:34:56 GMT express deprecated req.param(name): Use req.params, req.body, or req.query instead at routes\news.js:7:37
Application has thrown an uncaught exception and is terminated:
TypeError: Cannot read property 'category' of null
    at C:\Inetpub\vhosts\tvgfbf.gov.tr\tvgfbf\web\routes\news.js:12:42
    at model.Query.<anonymous> (C:\Inetpub\vhosts\tvgfbf.gov.tr\tvgfbf\persistence\node_modules\mongoose\lib\model.js:3928:16)
    at C:\Inetpub\vhosts\tvgfbf.gov.tr\tvgfbf\persistence\node_modules\kareem\index.js:297:21
    at C:\Inetpub\vhosts\tvgfbf.gov.tr\tvgfbf\persistence\node_modules\kareem\index.js:135:16
    at _combinedTickCallback (internal/process/next_tick.js:131:7)
    at process._tickCallback (internal/process/next_tick.js:180:9)