> For the complete documentation index, see [llms.txt](https://upgrade-platform.gitbook.io/upgrade-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://upgrade-platform.gitbook.io/upgrade-documentation/developer-guide/faq-error-resolution.md).

# Troubleshooting

- [Relation ‘experiment\_condition’ already exists](https://upgrade-platform.gitbook.io/upgrade-documentation/developer-guide/faq-error-resolution/relation-experiment_condition-already-exists.md)
- [User not found. Authorization error](https://upgrade-platform.gitbook.io/upgrade-documentation/developer-guide/faq-error-resolution/user-not-found.-authorization-error.md)
- [Token is not present in the request header](https://upgrade-platform.gitbook.io/upgrade-documentation/developer-guide/faq-error-resolution/token-is-not-present-in-the-request-header.md)
- [nodemon exits without explanation](https://upgrade-platform.gitbook.io/upgrade-documentation/developer-guide/faq-error-resolution/nodemon-exits-without-explanation.md)
- [Unable to find New Relic module configuration](https://upgrade-platform.gitbook.io/upgrade-documentation/developer-guide/faq-error-resolution/unable-to-find-new-relic-module-configuration.md)
- [No email received for export data](https://upgrade-platform.gitbook.io/upgrade-documentation/developer-guide/faq-error-resolution/no-email-received-for-export-data.md)
- [Opening a new tab in UpGrade prompts for re-authorization](https://upgrade-platform.gitbook.io/upgrade-documentation/developer-guide/faq-error-resolution/opening-a-new-tab-in-upgrade-prompts-for-re-authorization.md)
- [Error: Cannot find module 'upgrade\_types' (or a type from 'upgrade\_types' does not exist)](https://upgrade-platform.gitbook.io/upgrade-documentation/developer-guide/faq-error-resolution/error-cannot-find-module-upgrade_types-or-a-type-from-upgrade_types-does-not-exist.md)