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Author Topic: Error writing to Uno Board  (Read 879 times)
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My uno board worked on this computer at one time but I dont know what changed since then. 

I am running Windows 7 x64.  Usb port to the Uno board.  the device manager says there is a Uno board on com3.  The compiler list the board as an Uno on Com3.  When I try to write any program to it (blink.ino) I get an error.

F:\arduino-1.0.1\hardware\tools\avr\bin\avr-ar: unable to rename 'core.a'; reason: Permission denied[/i]

I have tried the Uno board on another computer and it works fine.  I have a feeling it is not communicating to the Uno thru this com port.  i have tried uninstalling the driver several times with no luck. 

Any suggestions?  I did go thru all the trouble shooting ideas but didnt find anything that worked.

Thanks in advance...
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> F:\arduino-1.0.1\hardware\tools\avr\bin\avr-ar: unable to rename 'core.a'; reason: Permission denied

That isn't a problem with your UNO, it a problem with the Arduino installation on your PC.  Try re-installing the Arduino IDE.
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I have tried uninstalling the Uno driver several times.  It is set to com3.  I have a feeling that it is having trouble talking to the com port.  Any other ideas?  I do believe its a computer problem and not an uno problem.
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I have tried uninstalling the Uno driver several times.  It is set to com3.  I have a feeling that it is having trouble talking to the com port.  Any other ideas?  I do believe its a computer problem and not an uno problem.

Right click properties to arduino folder and set full control to "everyone" on permissions. (but I am not sure why arduino tries to open that file anyway)
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I tried that.  I did have to change some permissions but it still didnt fix the issue.

Any other ideas?
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From your windows desktop right click on icon for arduino properties  left click, then click Compatibility under compatibility mode select Windows 7 then Privilege level check Run this program as an administor then ok.
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