Views problem on a random order block

Here's my problem. I have a new block View I created that features the day view of my drupal calendar. Block View here is filtered by the month (option: now) and sorted in "random" order.

Problem is, the block works completely fine once I enable it BUT, on every page I have it set to I get an error message warning: Invalid argument supplied for foreach() in /home/user/public_html/dpal/includes/tablesort.inc on line 149, 187, and 766.

So what can be done to fix this? It's odd that the block view itself still shows up and works perfectly. Anyone know the answer here? Thanks.