warning when generating thumbnails

[phiw13]

Probably known, but I’ll mention it anyway:

when creating thumbnail image in the Edit Images panel I get the following warning, but images are generated:

Warning "imagepng(/Users/username/Sites/_emps/images/7t.png): failed to open stream: Permission denied"
in /Users/username/Sites/_emps/textpattern/lib/class.thumb.php at line 444.
adminErrorHandler()
textpattern/lib/class.thumb.php:444 imagepng()
textpattern/lib/txplib_misc.php(1783) : eval()'d code:398 wet_thumb->write()
textpattern/lib/txplib_misc.php(1783) : eval()'d code:456 smd_thumb->write_image()
textpattern/lib/txplib_misc.php(1783) : eval()'d code:644 smd_thumb_make()
smd_thumb_edit()
textpattern/lib/txplib_misc.php:1896 call_user_func_array()
callback_event()
textpattern/lib/txplib_misc.php:2091 call_user_func_array()
textpattern/include/txp_image.php:631 pluggable_ui()

latest code to date, post v0.31, TXP 4.6dev