> For the complete documentation index, see [llms.txt](https://docs.viesus.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.viesus.com/support/error-codes.md).

# Error Codes

Each VIESUS interface returns its own set of error codes. Pick the interface below, then look up the specific code on its reference page.

For symptom-based troubleshooting (when you don't have a specific code), see [Troubleshooting](/support/troubleshooting.md).

<table data-view="cards"><thead><tr><th></th><th></th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td><h4>CLI Exit Codes</h4></td><td>Exit codes from the image-enhancement engine — general, processing, scene/AI, and license/GUID errors.</td><td><a href="/pages/55eaVENv5NuBHF8eg5SO">/pages/55eaVENv5NuBHF8eg5SO</a></td></tr><tr><td><h4>PDF Enhancer Error Codes</h4></td><td>Error codes from the PDF Enhancer's XML processing report — system, file-system, PDF processing, trigger, and cropping errors.</td><td><a href="/pages/d99r8HxnFBAxZcA6e9mJ">/pages/d99r8HxnFBAxZcA6e9mJ</a></td></tr><tr><td><h4>Node.js Error Codes</h4></td><td>Return codes from the Node.js module — positive values are processing times in ms, negative values indicate errors.</td><td><a href="/pages/mQMRmOUQY1enlidOZeXN">/pages/mQMRmOUQY1enlidOZeXN</a></td></tr></tbody></table>


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