# Universal Copy Service failed to validate the Output Folder error on the NextSeq 1000/2000 Universal Copy Service (UCS) copies sequencing output files from the run folder to BaseSpace Sequence Hub (if applicable) and the output folder. **Error Language**: Universal Copy Service failed to validate the Output Folder. Retry and, if error persists, contact Illumina Technical Support. Figure 1: Example of error in NextSeq 1000/2000 control software.\ ![](https://761066130-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FGM9W2DuBTgEXv1ClCm8H%2Fuploads%2Fgit-blob-3830ce6e4f3886d4798054940502ac8c240dd0e7%2Fimage1.png?alt=media\&token=a44bbc2a-b5c0-44e8-b96e-2e358e33fa02) **Troubleshooting steps:** 1. The NextSeq 1000/2000 Control Software requires at least two levels of nested folders to recognize the location of the output folder on the mounted network drive/external portable drive. 2. Make sure that the information in the fstab file is correct. (ie, group-level permissions are set correctly, and no syntax errors are present). \ \ \
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