looks like your database is not working ok
if you look into yours bo.json ( be) file you will see that you are missing many lines
if you look into my bo.json ( nl) you will see all the lines you need
try to copy my txt into your bo.json file and look if the graphs are working for test
hope this will help
greetings
bo.json.be.txt (536 Bytes)
bo.json.nl.txt (6 KB)