Mod Calendar Goes to a Blank Page

Hello,

I have 0.8.1 installed and have a problem with mod availability calender. When I put dates and hit check web page goes to a blank page. I checked it deeply and notice that the link doesn't have the id. It's blank. When I put my asses id manually page come as usual

Here is the url that I am talking about.
/index.php?id=&checkin=24-03-2015&checkout=25-03-2015&option=com_solidres&task=reservationasset.checkavailability&Itemid=8&60c9c4ab0d6961f018033e31110cace1=1

Works like this if i add manually the id number
/index.php?id=8&checkin=24-03-2015&checkout=25-03-2015&option=com_solidres&task=reservationasset.checkavailability&Itemid=8&60c9c4ab0d6961f018033e31110cace1=1

I set default asset.
I also add target id in module manager to see it works but no luck.

I don't know what I am doing wrong. Please advise me possible solutions.

Thanks

Thanks for your prompt answer. Works perfect right now

Thanks