Please try (running the sketch) again so the error occurs again, then go back to the home page in CircuitBlocks, scroll to the bottom, and in the footer, you will find a “Send error report” button.
Clicking it will open a window showing all the information which will be sent, which includes the error that happened as well as some other info about your system that might help us resolve your problem.
When you click “Send report”, the report will be sent to tour servers, and you will get a report ID. Please get back to us with that ID, and we’ll be able to assist further.