Hey, thanks.
Sync didn't work but when I added 2 minutes to my clock it did solve the problem.
The error message disappeared (Good progress!), but it's still doesn't work.
I just noticed "INFO com.heatledger.HeatProperties - heat.apiKey not defined"
Do I have to config something (heat.apiKey) in my "heat-default.properties" file?
If you are using the wallet, you dont need to define an API key as the mining button will only work if your API key is disabled.
Also note that you most likely also have a heat.properties file, it will override the settings in the heat-default.properties file.