Hi @itsnathanblake
It looks like you have named the file as brt.lsp but still the extension of the file is .txt. The .txt is not visible since the option of "file name extension" is disabled. Try turning it on (see snapshot below) in file explorer and then remove the file extension .txt from file and press enter that would fix the issue 😉🙂

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ವಿನೋದ್ ಕೆ ಎಲ್( System Design Engineer)

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