Moodle 2.6 using essential theme resources ->file . file uploading not showing the file picker. I was checked purge cache, java script and ajax options. but issue is not solved. please help me to resolve this problem.
I am having the same problem, when I run the JS Console on Chrome this is the message I get:
Uncaught TypeError: Cannot read property 'all' of null
Grateful for any guidance, not a programmer just an administrator.