No Lowest Priority Node Found (path: MO)

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Bug Report

Introduction

This article aims to provide a detailed explanation of the "No lowest priority node found (path: mO)" error, which is a common issue encountered by users of the Deno extension in Visual Studio Code (VS Code). We will delve into the possible causes of this error, provide step-by-step solutions, and offer additional troubleshooting tips to help you resolve the issue.

Understanding the Error

The "No lowest priority node found (path: mO)" error is a cryptic message that can be frustrating to diagnose. However, with the right guidance, you can identify the root cause of the issue and take corrective action.

Possible Causes

The error is often related to the Deno executable path not being included in the allowed read paths in the "prod" task of the deno.json file. This can lead to a permission prompt when running the Deno executable, causing the error.

Solution 1: Update Deno JSON

To resolve the issue, you need to update the deno.json file to include the Deno executable path in the allowed read paths. Here's a step-by-step guide:

  1. Run which deno in your terminal: Open your terminal and run the command which deno to get the full path of the Deno executable.
  2. Add the path to the --allow-read list: Update the "prod" task in your deno.json file to include the Deno executable path in the allowed read paths.

Solution 2: Update Deno Extension

If updating the deno.json file doesn't resolve the issue, you may need to update the Deno extension in VS Code. Here's how:

  1. Check for updates: Open the Extensions panel in VS Code and check for updates to the Deno extension.
  2. Update the extension: If an update is available, click the "Update" button to install the latest version.

Additional Troubleshooting Tips

If you're still experiencing issues after updating the deno.json file and the Deno extension, try the following:

  1. Restart VS Code: Sometimes, a simple restart can resolve the issue.
  2. Check for conflicts: If you're using multiple extensions that interact with Deno, try disabling them one by one to identify the conflicting extension.
  3. Verify the Deno executable path: Double-check that the Deno executable path is correct and included in the allowed read paths.

System Information

To help us better understand the issue, please provide the following system information:

  • VS Code version: Code - Insiders 1.100.0-insider (f56819db693dba84feb3716e278b5be0a7378633, 2025-04-17T05:10:42.956Z)
  • OS version: Darwin arm64 24.3.0
  • Extension version: 0.27.2025041802
  • Modes: Agent mode

A/B Experiments

Please provide the output of the A/B experiments:

vsliv368:30146709
vspor879:30202332
vspor708:30202333
vspor363:30204092
vsc_aacf:30263846
pythonvspyt551:31249597
vscod805cf:30301675
c4g48928:30535728
962ge761:30841072
dsvsc014:30777825
dsvsc015:30821418
2e7ec940:31000449
pythontbext0:30879054
cppperfnew:30980852
dwnewjupyter:31046869
pythonrstrctxt:31093868
nativeloc1:31118317
e80f6927:31120813
dwcopilot:31158714
c3hdf307:31184662
6074i472:31201624
dwoutputs:31242946
customenabled:31248079
hdaa2157:31222309
copilot_t_ci:31222730
g012b348:31231168
pythoneinst12:31251391
treesitterini:31278752
bgtreat:31252123
c7cif404:31283753
31787653:31262186
3e8i5726:31271747
pythonpulldiag:31287486
6gi0g917:31259950
editoredits36407:31282444
996jf627:31264550
pythonrdcb7:31268811
useunpkgapi:31288273
gh9da704:31280609
747dc170:31275146
g20af354:31278749
6518g693:31287811
pylancecolor:31288664
generatesymbolt:31280541
convertfstringf:31280702
gendocf:31280703

By following these steps and providing the necessary system information, you should be able to resolve the "No lowest priority node found (path: mO)" error and continue using the Deno extension in VS Code without any issues.

Frequently Asked Questions

Q: What is the "No lowest priority node found (path: mO)" error?

A: The "No lowest priority node found (path: mO)" error is a cryptic message that can be frustrating to diagnose. It is often related to the Deno executable path not being included in the allowed read paths in the "prod" task of the deno.json file.

Q: Why do I need to update the Deno executable path in the deno.json file?

A: The Deno executable path needs to be included in the allowed read paths to avoid a permission prompt when running the Deno executable. This is a security feature to prevent unauthorized access to the Deno executable.

Q: How do I update the Deno executable path in the deno.json file?

A: To update the Deno executable path in the deno.json file, follow these steps:

  1. Run which deno in your terminal to get the full path of the Deno executable.
  2. Update the "prod" task in your deno.json file to include the Deno executable path in the allowed read paths.

Q: What if I'm still experiencing issues after updating the Deno executable path?

A: If you're still experiencing issues after updating the Deno executable path, try the following:

  1. Restart VS Code to see if the issue resolves itself.
  2. Check for conflicts between extensions that interact with Deno.
  3. Verify that the Deno executable path is correct and included in the allowed read paths.

Q: Can I disable the Deno extension to resolve the issue?

A: While disabling the Deno extension may resolve the issue, it's not a recommended solution. The Deno extension is a powerful tool that provides many features and benefits. Instead, try updating the Deno executable path in the deno.json file or checking for conflicts between extensions.

Q: What if I'm using a different version of Deno or VS Code?

A: If you're using a different version of Deno or VS Code, the solution may vary. Check the documentation for your specific version to see if there are any known issues or workarounds.

Q: Can I get help from the Deno team or VS Code team?

A: Yes, you can get help from the Deno team or VS Code team by submitting a bug report or reaching out to their support channels. They may be able to provide additional guidance or assistance to resolve the issue.

Q: What are some common causes of the "No lowest priority node found (path: mO)" error?

A: Some common causes of the "No lowest priority node found (path: mO)" error include:

  • The Deno executable path not being included in the allowed read paths in the "prod" task of the deno.json file.
  • Conflicts between extensions that interact with Deno.
  • Incorrect or outdated Deno or VS Code versions.

Q: How can I prevent the "No lowest priority node found (path: mO)" error in the future?

A: To prevent the "No lowest priority node found (path: mO)" error in the future, make sure to:

  • Update the Deno executable path in the deno.json file regularly.
  • Check for conflicts between extensions that interact with Deno.
  • Verify that the Deno executable path is correct and included in the allowed read paths.

By following these tips and troubleshooting steps, you should be able to resolve the "No lowest priority node found (path: mO)" error and continue using the Deno extension in VS Code without any issues.