Upgrade for 1.8?

[nier3]

Hi, today I have upgraded mybb to 1.8 and installed xthreads from Github.
Then I have uploaded files in /uploads (201210,201211 etc), but Custom Thread Fields with "Upload file or image from PC or from Url" seem don't work

Other Custom Thread Fields (for example I use it for insert a link, text etc) instead seem work.

Images there aren't but I have uploaded folders in /uploads folder.

And in forumdisplay_threadlist (I use an image of preview with xthreads) I have many errors like:

Quote:

Si sono verificati i seguenti errori:

Warning [2] Illegal string offset 'value' - Line: 16 - File: forumdisplay.php(1301) : eval()'d code PHP 5.4.4-14+deb7u14 (Linux)

File Line Function

/forumdisplay.php(1301) : eval()'d code 16 errorHandler->error
/forumdisplay.php 1301 eval

Warning [2] Illegal string offset 'value' - Line: 16 - File: forumdisplay.php(1301) : eval()'d code PHP 5.4.4-14+deb7u14 (Linux)

File Line Function

/forumdisplay.php(1301) : eval()'d code 16 errorHandler->error
/forumdisplay.php 1301 eval

Warning [2] Illegal string offset 'value' - Line: 16 - File: forumdisplay.php(1301) : eval()'d code PHP 5.4.4-14+deb7u14 (Linux)

File Line Function

/forumdisplay.php(1301) : eval()'d code 16 errorHandler->error
/forumdisplay.php 1301 eval

Thank you in advance, sorry for my bad English