error while fetching the data

error while fetching the data

At http://zohocreator.com/ramonwk/proefformulier/
I spent a weekend to add data. Retreiving it worked fine. Now all I get is "error while fetching the data". I have no way to correct this or see the raw data. How can I fix this. Entering all data took me about 24 hours!
ramonwk