Error uploading

Using Arduino Programming Questions
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Sketch uses 444 bytes (1%) of program storage space. Maximum is 32256 bytes.
Global variables use 9 bytes (0%) of dynamic memory, leaving 2039 bytes for local variables. Maximum is 2048 bytes.
avrdude: ser_open(): can't open device "\.\COM3": The semaphore timeout period has expired.

Failed uploading: uploading error: exit status 1

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Welcome to the forum

Please provide more information such as which Arduino board you are using and which board you have selected in the IDE

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