Hi ataheri,
I would suggest first that you check that you have entered the required information in all of the other Panels of the Map Setup screens, including the API Key in the Geo Locator panel if you haven't done that already. Adding markers is probably the last step in the whole Map Setup process.
Can you confirm that your map is set up to use Standard Map Points?
Finally, the problem looks like there is data on your database which contains 0500-01 in one of the fields and without looking at the source code I couldn't really guess which tables it's pulling this data from. It could depend on a few things.
One way you can find out which table and column the data is in would be to search all tables for any occurrence of the string. Fortunately, I found a thread which contains some SQL for you to do just that! The thread can be found here. Post number 2 in the thread is what you need, although I think someone else posts a slightly fuller version of the code later in the thread as well.
I would suggest trying to use this, and then let us know if your "0500-01" value is found in the database and if so, where. I'm guessing tt'll help us to find the cause of the problem.