today i upgraded to 1.8.7
when i want to switch theme it shows this error
Fatal error: Call to undefined function get_theme() in
inc/datahandlers/user.php on line 893
How to fix this now 
from which version of MyBB you have upgraded ? was it 1.6.x ?
function get_theme() should be available from
functions.php file of
both 1.8.6 &
1.8.7 versions of MyBB
not sure how you are getting above referred error.
anyway, assuming that your forum meets
support eligibility policy
you may PM me
temporary access to your forum admin panel & files (FTP) to check
where is the function get_theme() created?
because it shows the error even when i want to edit the time setting on user cp
i rcv this
\
Fatal error: Call to undefined function get_supported_timezones() in
/inc/datahandlers/user.php on line 933
seems those functions calling other function and that function is located where?
ok ill check,.
ok i guess the issue is solved it
thank u so much
it helped me