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The Sonos app can show Error 1001 or Error 1002 when your Sonos system is having trouble connecting to the music library on your computer or NAS drive. These errors usually occur when the computer or NAS drive is either offline or having trouble maintaining a reliable connection to the network.  
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This article includes common errors you may encounter when setting up your Sonos home theater product and some links to helpful troubleshooting guides to resolve them. If the error you’re seeing is not listed below, see our “Fix an Issue” page for more help.  
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This error appears when Sonos is trying to play music from a computer or NAS, but the computer does not have its file and folder sharing permissions set correctly. Below are some common steps you can take to resolve this error.  
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The Sonos app can show Error 900 when your Sonos system is having trouble adding a new music library share to your system. 
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If you see Error 4 while updating, it means that your Sonos product was not able to apply the update to its internal memory.Since this error can show up because of a problem with the Sonos hardware, please contact Sonos Support for assistance.
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The Sonos app can show a “Computer refused the connection” error when your Sonos system is trying to access your music library.
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Some errors can occur before or during the Trueplay tuning process. This article provides some additional details about these errors and some tips to help resolve them. If Trueplay tuning was successful but you are not satisfied with the resulting sound of your speakers, see our article on troubleshooting an undesired or no change after Trueplay tuning.  
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This error occurs when a portable Sonos product tries to update its software while on battery power and the battery is at or below 20% charge.
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Error 803 occurs when a Sonos product with older software tries to perform an update after it’s been added to a Sonos system with newer software.If you see Error 803 when trying to update, please contact Sonos Support for assistance.
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This error can occur when Sonos is unable to find the computer or device hosting your music library.
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