Dear all
I have problem when I making search for image in joomla >> k2 >> item >> image.
I receive this error:

Invalid backend response.
Data is empty.

I searched from google for solution. there are one idea for this issue its:
enable proc_open() functions in php.ini
but from disabled functions in php.ini I dont find proc_open().
I'm using
joomla 2.5.18
k2 2.5.7

There was a similar discussion here or see this - a post from Lefteris

If you're really using K2 v2.5.7 please upgrade to v 2.6.7

how can I update it could you help me please?

Hi Alan,

can update your extensions by going to Extensions - Extension Manager and click tab Update.

Best regards

yea I know
but dont show me any update ..
after Purge Cache I see the update. thank you I will update k2 V now

Hi all
I updated k2 to 2.6.7 but still receive this problem when I making search for image in joomla >> k2 >> item >> image:

Invalid backend response.
Data is empty.

I searched from google for solution. there are one idea for this issue its:
enable proc_open() functions in php.ini
but from disabled functions in php.ini I dont find proc_open().
I'm using
joomla 2.5.18
k2 2.6.7

Please see the link i've pasted on my first reply. Did you read ? It explains why this is happening. See the post by Lefteris.