In the K2 item.php model on line 773 the model looks for a file:

if (JFile::exists(JPATH_PLUGINS.DS.'content'.DS.'jw_sigpro.php') || JFile::exists(JPATH_PLUGINS.DS.'content'.DS.'jw_sig.php')) {

The file that installed with SIG was named jwsig.php so it doesn't find it and thinks that the SIG is not installed.

Hi Chris,

You are using the Free version of SIG, which is not supported in K2.
Latest version of SIG Pro is 2.0.5

Simon
K2 Support

At me SIG Pro doesn't works with K2 2.3. If I upload a zip images file, it shows me UNKNOWNARCHIVETYPE
Gallery upload error: Cannot extract archive!
I wrote on this problem but nobody reply to me. I think I must change extension.

Hi Duilio,

Make sure your zip file contains image with the good extension :
.png or .jpg (no uppercase)

Reinstall K2 and/or SIG and check qrite access to joomla cache folder (/cache).

Olivier

Duilio said:At me SIG Pro doesn't works with K2 2.3. If I upload a zip images file, it shows me UNKNOWNARCHIVETYPE Gallery upload error: Cannot extract archive!
I wrote on this problem but nobody reply to me. I think I must change extension.

Hi Oliver, thanks for answere. I tried to reinstall K2 and SIG Pro, I checked write access of /cache folder and images are JPG but nothing to do, It doesn't works. In a my local site all works fine but on a remote site...nothing. Please help me.