# Why does custom lut not work? You can check if the lut is a valid lut file in other software at first. If D5 is installed in a non-English path, the custom lut file may fail to read. > Although the installation path is checked during installation, if you manually change the installation path to non-english after a successful installation, it will also cause this error. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.d5render.com/user-guide/effect/why-does-custom-lut-not-work.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.