Sketch uses 924 bytes (2%) 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 set com-state for "\.\COM4"
Failed uploading: uploading error: exit status 1
What other windows or activities are open/running?
See if these instructions will solve your problem: Port monitor error: command 'open' failed: Invalid serial port. Could not connect to COM serial port - #49 by ptillisch
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