I attempted to upload a simple program to mBot from Chromebook with mBlock 3. It failed and i got a compile error that starts like this: Picked up JAVA_TOOL_OPTIONS: Exception in thread “main” java.awt.AWTError: Can’t connct to…
What could be wrong? I tried to do it to another mBot, and again compiling error. From Windows pc i could send the same program to the same mBots.
Hi jukkasyalli,
We’ll have a check, thanks for your feedback.
Please try windows mblock 3 online version, to see if there is any issue.
And you are suggested to use mBlock 5 online version which has ChromeOS version.
Now it works again! 
I guess you did something for the server. Thank you very much for quick reactions!
I love mBots, they are perfect for teaching coding and robotics for children at school.
jukkasyalli
Finland
Glad to hear that. By the way you can also try mBlock 5-web version as no more update will be added to mBlock 3.
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