Fishstrap Issues

System.IO.FileNotFoundException: Could not load file or assembly…

Causes

• You are missing .NET Desktop Runtime 6.0.36
• Your .NET installation is corrupted or incomplete

Solution

1. Check installed runtimes through Command Prompt or PowerShell:

   PowerShell

   dotnet --list-runtimes

   Look for a line that says Microsoft.WindowsDesktop.App 6.0.36. If it’s missing or Command Prompt/PowerShell says dotnet is not a command, the runtime isn’t installed correctly.

2. Install .NET Desktop Runtime 6.0.36 (not just .NET Runtime) from https://dotnet.microsoft.com/en-us/download/dotnet/6.0

System.Net.Http.HttpRequestException: …

Causes

• Roblox is down at the moment
• You are using a VPN, Cloudflare WARP, or a proxy
• You have incorrect deployment settings in Fishstrap
• You are affected by government censorship or network restrictions

Solution

1. Visit the Roblox Status page to see if Roblox is working.

2. Try disabling/enabling your VPN or proxy and check if the issue persists.

3. Visit the Deployment tab in Fishstrap, set your channel to production and set Automatic channel change action to Never change.

My exploits / hacks don’t work!

We at Fishstrap take this very seriously. Please follow this link for further help.

FastFlags are not working

Causes

• You are using FastFlags not on Roblox’s official allowlist
• You are expecting Studio behavior in the client

Solution

As of late 2025, Roblox enforces an allowlist for FastFlags on the client (the one used to play games). See the allowlist in this Devforum post. All FastFlags still work in Roblox Studio.

Global Settings tab is grayed out

Causes

• You haven’t launched Roblox with Fishstrap yet to initialize configuration

Solution

1. Launch any game through Fishstrap at least once to initialize configuration.

2. Close Roblox and reopen Fishstrap’s settings to edit Global Settings.

Stuck on “Waiting for data…”

1. Cancel the launch by pressing Cancel button on the bootstrapper window.

2. Try rejoining the same game and see if the issue persists.

3. If the issue does persist, you could try forcing local data by manually editing the settings file. Open %LOCALAPPDATA%\Fishstrap\Settings.json in your preferred text editor and find the property called ForceLocalData, then change its value to true:

   Settings.json

   {
     // ...
     "ForceLocalData": false,
     "ForceLocalData": true,
     // ...
   }

“The JSON you’ve entered does not appear to be valid.”

Causes

• You have an incorrect JSON syntax or misformatted FastFlag entries

Solution

Use a JSON verification tool like JSONLint to validate your JSON.