# After opening cnc\_ctrl\_v1.ino I get an upload error

**URL:** <https://forums.maslowcnc.com/t/after-opening-cnc-ctrl-v1-ino-i-get-an-upload-error/8186>\
**Category:** Uncategorized\
**Created:** [December 22, 2018, 7:05pm UTC](https://forums.maslowcnc.com/t/after-opening-cnc-ctrl-v1-ino-i-get-an-upload-error/8186 "2018-12-22T19:05:50Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![jpatte4](https://avatars.discourse-cdn.com/v4/letter/j/f04885/32.png) [@jpatte4](https://forums.maslowcnc.com/u/jpatte4)\
**Post date:** [December 22, 2018, 7:05pm UTC](https://forums.maslowcnc.com/t/after-opening-cnc-ctrl-v1-ino-i-get-an-upload-error/8186/1 "2018-12-22T19:05:50Z")

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After opening this file I get this message when I hit the upload arrow: Arduino: 1.8.8 (Windows 10), Board: “Arduino/Genuino Mega or Mega 2560, ATmega2560 (Mega 2560)”

c:\users\john\downloads\arduino-1.8.8-windows\arduino-1.8.8\hardware\tools\avr\bin…/lib/gcc/avr/5.4.0/…/…/…/…/avr/bin/ar.exe: unable to rename ‘core\core.a’; reason: File exists

exit status 1  
Error compiling for board Arduino/Genuino Mega or Mega 2560.

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

What is causing this error?

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<div class="post-metadata">

**Author:** ![Bee](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/bee/32/2160_2.png) [@Bee](https://forums.maslowcnc.com/u/Bee)\
**Post date:** [December 22, 2018, 7:06pm UTC](https://forums.maslowcnc.com/t/after-opening-cnc-ctrl-v1-ino-i-get-an-upload-error/8186/2 "2018-12-22T19:06:32Z")

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Is the file unzipped?

Thank you

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<div class="post-metadata">

**Author:** ![jpatte4](https://avatars.discourse-cdn.com/v4/letter/j/f04885/32.png) [@jpatte4](https://forums.maslowcnc.com/u/jpatte4)\
**Post date:** [December 22, 2018, 7:08pm UTC](https://forums.maslowcnc.com/t/after-opening-cnc-ctrl-v1-ino-i-get-an-upload-error/8186/3 "2018-12-22T19:08:05Z")

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I believe so. Let me see if I can verify that.

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<div class="post-metadata">

**Author:** ![Bee](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/bee/32/2160_2.png) [@Bee](https://forums.maslowcnc.com/u/Bee)\
**Post date:** [December 22, 2018, 7:12pm UTC](https://forums.maslowcnc.com/t/after-opening-cnc-ctrl-v1-ino-i-get-an-upload-error/8186/4 "2018-12-22T19:12:04Z")

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If it is unzipped try moving it to of c:\users\john\

shorten the path.

Your user path is looking long Windows could be tripping over it’s self on path size limit.

Thank you