Error message: Elegoo Robot car

Projects Programming
1

Here is an error message which I don't understand. Can you assist?

Arduino: 1.8.3 (Windows 7), Board: "Arduino/Genuino Uno"

Sketch uses 2604 bytes (8%) of program storage space. Maximum is 32256 bytes.
Global variables use 237 bytes (11%) of dynamic memory, leaving 1811 bytes for local variables. Maximum is 2048 bytes.
avrdude: ser_open(): can't open device "\.\COM3": Access is denied.

Problem uploading to board. See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.
An error occurred while uploading the sketch
Exception in thread "Thread-105" java.util.ConcurrentModificationException
at java.util.LinkedList$LLSpliterator.forEachRemaining(LinkedList.java:1239)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
at cc.arduino.contributions.libraries.LibrariesIndexer.rescanLibraries(LibrariesIndexer.java:127)
at processing.app.BaseNoGui.onBoardOrPortChange(BaseNoGui.java:683)
at processing.app.Base.onBoardOrPortChange(Base.java:1297)
at processing.app.Editor$DefaultExportHandler.run(Editor.java:2179)
at java.lang.Thread.run(Thread.java:745)

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

2

Please use code tags (</> button on the toolbar) when you post code or warning/error messages. The reason is that the forum software can interpret parts of your code as markup, leading to confusion, wasted time, and a reduced chance for you to get help with your problem. This will also make it easier to read your code and to copy it to the IDE or editor. Using code tags and other important information is explained in the How to use this forum post. Please read it.

Make sure you have selected the port of your Uno from the Tools > Port menu.

3

Hi, ALWAYS get "blink" to upload successfully before any other new code.