—TWO-STEP FIX—
1) Open file: /wp-content/plugins/all-in-one-event-calendar/app/view/admin/js/jquery.blockUI.js
2) Modify line 17
from:
if (/1\.(0|1|2)\.(0|1|2)/.test($.fn.jquery) || /^1.1/.test($.fn.jquery)) {
to:
if (/1\.(0|1|2)\.(0|1|2)/.test($.fn.jquery) || /^1.10.0/.test($.fn.jquery)) {
—BONUS TROUBLESHOOTING—
If you are so inclined, modify the alert message on line 18 to show this plugin is indeed throwing the error. This way, if you see the same error message you will know the problem was elsewhere. e.g.:
from:
alert('blockUI requires jQuery v1.2.3 or later! You are using v' + $.fn.jquery);
to:
alert('THE PROBLEM IS STILL IN ALL-IN-ONE-CALENDAR- blockUI requires jQuery v1.2.3 or later! You are using v' + $.fn.jquery);