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I have just upgraded wordpress to version 4.7.3 on windows server 2008 R2. mysql is currently at version 5.1.72 and php was at version 5.6.

Everything worked fine.

I then added PHP 7.1.1 to IIS and changed to that version and now I get a 500 error on the web page.

I disabled all the plug ins and I still get the error. I reset the database password and I still get the error.

Is there anything else I can check/change/upgrade to resolve this?

Thanks

UPDATE

After enabling debug mode I get the following line in the error file

PHP Notice: Undefined index: input in D:\Websites\MYWEBSITE\wp-includes\kses.php on line 866

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    Check the actual error log or set WP_DEBUG to TRUE in wp-config.php. You'll see the errors that are causing the 500 response code – Jeffrey von Grumbkow Apr 12 '17 at 11:59
  • I am a wordpress noob where does the error file get saved – Silentbob Apr 12 '17 at 12:00
  • That has nothing to do with WordPress. The error log is on your server, where that is depends on how your server is setup. There for just set WP_DEBUG to TRUE in wp-config as that will output the errors on screen. – Jeffrey von Grumbkow Apr 12 '17 at 12:02
  • ive updated my question based on error file, debug to true doesnt output errors on screen for me it just shows 500 error – Silentbob Apr 12 '17 at 12:04
  • A notice is not a 500 error. – Brian Fegter Apr 12 '17 at 12:46

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