HI, after upgrading Joomla 3.6.2 to 3.6.3 I get this error when I want to edit a k2 article or make a new one.

0 Error decoding JSON data: Control character error, possibly incorrectly encoded

Where do I look for this? Is there an update for it?

Can you try disabling error reporting?
Which file is throwing that error?

Error reporting is off. Here is a screenshot.

imgur.com/FBfXuT1

Can you check on your error_log which file is throwing the error?
I am asking this because I cannot reproduce this behaviour using K2 2.7.1 and 2.7.2 DEV build.

It is possible that a 3rd party K2 extension is causing this issue.

Can you check on your error_log which file is throwing the error?
I am asking this because I cannot reproduce this behaviour using K2 2.7.1 and 2.7.2 DEV build.

It is possible that a 3rd party K2 extension is causing this issue.

I use a template from Gavick, and I do not use any thirdparty k2 extensions. I only enabled K2 and K2 system plugin and the problem still is there.

Would it help to download a fresh copy of K2 and install it again without losing stuff? Maybe a specific file is corrupt ?

This is what I typed to Gavick support:

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Hi, I want to notify that K2 throws in some problems after updating Joomla (technews) 3.6.2 to 3.6.3. I asked K2 and they asked me 2 things:

1. Check error_log. (Does the template have the errorlog string attached, cause I cannot seem to find the file.)
2. Do you use a third party k2 plugin? In the backend I cannot find any.

I need to be able to reproduce the problem for them and I have 40 websites with k2. The only one that gives me the problem is the one with the odd in it, your newstech template.

The error I get as soon as I want to click on an K2 article:
0 Error decoding JSON data: Control character error, possibly incorrectly encoded

Hello,

You can try installing the DEV version github.com/getk2/k2

This is a message from Robert Gavick. However, the php version I use is NOT PHP 7.0+, I use PHP 5.5.32.

I do not have any clue with this and I'm pretty f*cked if this can't be solved.

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1. There’s no error found in the error_log file.
2. There’s no k2 third party plugin activated
3. I’ve disabled completely K2 overriden files from TechNews template and the problem still occurs

Additional informations:
I’ve noticed that the problem occurs only on the server with PHP 7.0.x (with PHP 5.6.x there’s no problem).
K2 v.2.7.0 works properly
K2 v.2.7.1 and dev version 2.7.2 don’t work.

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Hello, I have the same problem, this happened when you upgrade joomla 3.6.3 and k2 2.7.1