This is a challenge cache, so you need to fulfill the challenge requirements before logging.
A "jasmer challenge" means that you need to log a cache that is hidden every month from when geocaching was invented in May 2000 and up to now. As of this writing (March 2015), that is a total of 179 months and the longer you wait the more months there will be to find. It is the early ones that are the difficult ones, though. From the earliest year there are only a couple of hundred active caches left world-wide.
This, however, is a "jasmer light" challenge. In order to make it possible for a reasonable number of cachers to complete it I won't require a completely full grid. Instead, you need to fill all the boxes for 2002 and onwards, and then a further nine boxes from 2000 and 2001 (in any combination). The reason for picking this number is that this is the maximum number of boxes that can be filled with currently active caches located in Sweden. You don't need to use only Swedish caches to qualify for this challenge, though.
My own jasmer grid which shows that I am qualified for this challenge (including one extra month, October 2000).