# 32U4 error

**URL:** <https://forum.arduino.cc/t/32u4-error/525858>\
**Category:** Programming\
**Created:** [May 13, 2018, 3:09pm UTC](https://forum.arduino.cc/t/32u4-error/525858 "2018-05-13T15:09:44Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![techytoon](https://avatars.discourse-cdn.com/v4/letter/t/c77e96/32.png) [@techytoon](https://forum.arduino.cc/u/techytoon)\
**Post date:** [May 13, 2018, 3:09pm UTC](https://forum.arduino.cc/t/32u4-error/525858/1 "2018-05-13T15:09:44Z")

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I can not get code to upload to my Arduino micro.

Build options changed, rebuilding all  
Sketch uses 7614 bytes (26%) of program storage space. Maximum is 28672 bytes.  
Global variables use 250 bytes (9%) of dynamic memory, leaving 2310 bytes for local variables. Maximum is 2560 bytes.  
processing.app.debug.RunnerException  
 at cc.arduino.packages.uploaders.SerialUploader.uploadUsingPreferences(SerialUploader.java:160)  
 at cc.arduino.UploaderUtils.upload(UploaderUtils.java:78)  
 at processing.app.SketchController.upload(SketchController.java:713)  
 at processing.app.SketchController.exportApplet(SketchController.java:686)  
 at processing.app.Editor$DefaultExportHandler.run(Editor.java:2168)  
 at java.lang.Thread.run(Thread.java:748)  
Caused by: processing.app.SerialException: Error touching serial port 'COM9'.  
 at processing.app.Serial.touchForCDCReset(Serial.java:107)  
 at cc.arduino.packages.uploaders.SerialUploader.uploadUsingPreferences(SerialUploader.java:144)  
 ... 5 more  
Caused by: jssc.SerialPortException: Port name - COM9; Method name - openPort(); Exception type - Port busy.  
 at jssc.SerialPort.openPort(SerialPort.java:164)  
 at processing.app.Serial.touchForCDCReset(Serial.java:101)  
 ... 6 more

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**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\
**Post date:** [May 13, 2018, 3:12pm UTC](https://forum.arduino.cc/t/32u4-error/525858/2 "2018-05-13T15:12:47Z")

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(deleted)

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**Author:** ![techytoon](https://avatars.discourse-cdn.com/v4/letter/t/c77e96/32.png) [@techytoon](https://forum.arduino.cc/u/techytoon)\
**Post date:** [May 13, 2018, 5:19pm UTC](https://forum.arduino.cc/t/32u4-error/525858/3 "2018-05-13T17:19:51Z")

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even though i tried that already, it worked. thank you!

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**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\
**Post date:** [May 5, 2021, 11:11pm UTC](https://forum.arduino.cc/t/32u4-error/525858/4 "2021-05-05T23:11:18Z")

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