docs: troubleshoot failed to fetch model

docs/docs/guides/07-troubleshooting/02-failed-to-fetch.mdx

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+---
+title: Failed To Fetch models
+slug: /troubleshooting/failed-to-fetch
+description: Troubleshooting "Failed to Fetch model"
+keywords:
+  [
+    Jan AI,
+    Jan,
+    ChatGPT alternative,
+    local AI,
+    private AI,
+    convZ
+    ersational AI,
+    no-subscription fee,
+    large language model,
+    troubleshooting,
+  ]
+---
+
+You may receive a "Error Occured: Failed to Fetch" response when you first start chatting with a selected model. 
+
+This may occur due to several reasons. Please follow these steps to resolve it:
+
+1. Ensure you are on the latest version of Mac, Windows or Ubuntu OS version
+    - Upgrading to the latest version has resolved this issue for most people
+
+2. Select a model that is smaller than 80% of your hardware V/RAM. 
+    - For example, if I have a 8GB machine, I should select models smaller than 6GB.
+
+3. Install the latest Nightly build from github linked in https://jan.ai/install/
+    - If you are reinstalling Jan, follow the uninstall instructions for your relevant OS to clear the application cache
+
+4.  Ensure your V/RAM is accessible by the application (some people have virtual RAM)
+5.  If you are on Nvidia GPUs, please download [Cuda](https://developer.nvidia.com/cuda-downloads)