# How to troubleshoot the GenomeStudio error "Index was outside the bounds of the array." ![](https://761066130-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FGM9W2DuBTgEXv1ClCm8H%2Fuploads%2Fgit-blob-312d824713872743540b32336428c86d32196685%2Fimage1.png?alt=media) The GenomeStudio error "Index was outside the bounds of the array." is usually generated during project creation. Possible causes (most common): * GenomeStudio cannot find a data point it is looking for (e.g missing or corrupted idat). * Manifest file selected is for the wrong Infinium beadchip type and/or version. * Cluster file selected is for the wrong Infinium beadchip type and/or version. Troubleshooting Steps: * Make sure that correct manifest and/or cluster files are in use. * In GenomeStudio, check the log file window at the bottom which may list a specific failure. * Issue is usually not related to the sample sheet, however, for troubleshooting purposes, try creating a project without a sample sheet to exclude this possible root cause. * Create a new project from the IDATs. If IDATs were provided by a colleague/collaborator, obtain a fresh copy of the IDATs as they may have gotten corrupted during the file transfer. * Re-download DMAP file and re-scan the beadchips. \ \ \
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