I get this message when I try to upload to my Arduino Nano
avrdude: ser_open(): can't open device "\.\COM3": Access is denied.
An error occurred while uploading the sketch
Exception in thread "Thread-49" 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 cc.arduino.contributions.libraries.LibrariesIndexer.setLibrariesFolders(LibrariesIndexer.java:106)
at processing.app.BaseNoGui.onBoardOrPortChange(BaseNoGui.java:682)
at processing.app.Base.onBoardOrPortChange(Base.java:1308)
at processing.app.Editor$DefaultExportHandler.run(Editor.java:2198)
at java.lang.Thread.run(Thread.java:748)
Please help me figure this out, I have been trying to do the device manager com3 driver install but that dosen't do anything.