My site was perfect with k2 2.70 to ...

Then I upgrade to Joomla 3.62 and updated the K2 to version 2.71, and identified an error in the website frontend.

I am using Joomla 3.62 with K2 v2.71 with folder permissions to 755 and 644 to archive permission are correct.

Yet this showing an error message for those who put items by the website frontend.

Detail on the site Frontend can never put image only text, entando that disabled the image part.

Only after I updated to version v2.71 k2, the user places the item and save the item in addition to appearing message successfully saved, appears a second message with the following error:

 "The image was not loaded. Please make sure that you used a valid image file and upload the file is configured according to your server"

When I checked the article by Backend, I notice that he entered normal only is presenting this error in the Frontend user screen.

In Backend not appear any error, this normal.

Only to the user in the frontend that uses the articles post, this appearing this message, after saving the new article.

Does anyone have an idea of ​​what may be occurring

Behind a possible solution

I am looking forward to a possible aid
I shall be grateful
much Success
Jose Carlos

Complementing the Error:

I did a test with Joomla updated to 3.62 but not updated the version of K2, that is ...

In tests, I noticed with Joomla 3.62 but without the update and using K2 v.2.70 version, there is the problem that I mention above.

This may prove that the problem is in k2 version v.2.71 and not in Joomla 3.62

Does anyone have any idea what might be, to help?

I await help
Thank you
Success!!!
Jose Carlos

Are you using any overrides for the itemform.php file?
If yes, can you temporarily remove them?

Also you should update to 2.7.1

Krikor
Hello
Already with k2 v2.71, in fact as we have more than one site, others equal only for testing, just testing also with version v2.70 k2 but both have the problem of error keep.
Perhaps this shows that the error persists in both versions.
In fact the error is only with the mesnagem that appears when using the tool it seems to work all perfect, but to save the frontend it presents only the message
Thank you so much
Success
Jose Carlos

I am sorry but I cannot verify this behaviour,
I am using Joomla! 3.6.2 K2 2.7.1 and the DEV version ( github.com/getk2/k2 ) both work as expected.

Try the following:
Revert to the default template to make sure that it is not an override issue.
Deactivate all K2 related extension to see if this is an extension issue.