docs: added new troubleshooting sections (#4571)

* docs: added troubleshooting section for EADDRINUSE

* added custom hooks troubleshooting

* fix tab issues

* fix double active items in sidebar

* Update sidebars.js

docs/content/create-medusa-app.mdx

@@ -14,6 +14,7 @@ import OtherErrorsSection from "./troubleshooting/create-medusa-app-errors/_othe
 import EagainError from "./troubleshooting/create-medusa-app-errors/_eagain-error.md"
 import ConnectionErrorSection from './troubleshooting/database-errors/_connection-error.md'
 import FreshInstallationSection from './troubleshooting/awilix-resolution-error/_fresh-installation.md'
+import EaddrinuseSection from './troubleshooting/eaddrinuse.md'
 
 # Install Medusa with create-medusa-app
 
@@ -149,6 +150,10 @@ Based on what you're building, you can find a development path for you in the Re
 
 <Troubleshooting
   sections={[
+    {
+      title: 'Error: EADDRINUSE',
+      content: <EaddrinuseSection />
+    },
     {
       title: "EAGAIN error",
       content: <EagainError />

docs/content/development/backend/install.mdx

@@ -10,6 +10,7 @@ import Troubleshooting from '@site/src/components/Troubleshooting'
 import SaslSection from '../../troubleshooting/database-errors/_sasl.md'
 import ConnectionErrorSection from '../../troubleshooting/database-errors/_connection-error.md'
 import FreshInstallationSection from '../../troubleshooting/awilix-resolution-error/_fresh-installation.md'
+import EaddrinuseSection from '../../troubleshooting/eaddrinuse.md'
 
 # Install Medusa Backend
 
@@ -99,6 +100,10 @@ curl localhost:9000/store/products
       title: 'Error: connect ECONNREFUSED ::1:5432',
       content: <ConnectionErrorSection />
     },
+    {
+      title: 'Error: EADDRINUSE',
+      content: <EaddrinuseSection />
+    },
     {
       title: 'AwilixResolutionError: Could Not Resolve X',
       content: <FreshInstallationSection />

docs/content/starters/nextjs-medusa-starter.mdx

@@ -113,6 +113,16 @@ Your Next.js Starter Template is now running at `localhost:8000`
 
 ## Development Notes
 
+### Changing Medusa Backend URL
+
+By default, the Medusa backend runs at `http://localhost:9000`. This value is defined in your Next.js starter template under the environment variable `NEXT_PUBLIC_MEDUSA_BACKEND_URL`.
+
+If you need to change the URL of your Medusa backend because you changed the backend's default port or because you deployed your backend, change the value of `NEXT_PUBLIC_MEDUSA_BACKEND_URL` (typically in `.env.local`) to your backend URL. For example:
+
+```bash
+NEXT_PUBLIC_MEDUSA_BACKEND_URL=http://localhost:9001
+```
+
 ### Toggle Search Engine Feature
 
 The Next.js Starter Template by default is compatible with MeiliSearch.

docs/content/troubleshooting/custom-hooks-error.md

@@ -0,0 +1,17 @@
+---
+title: createCustomAdminHooks Error
+---
+
+If you've installed Medusa prior to v1.12.3 with the `create-medusa-app` command, then you try to update the `@medusajs/medusa` and `@medusajs/admin` to the latest `beta` versions, you might run into the following error when running your Medusa backend:
+
+```bash
+Module '"medusa-react"' has no exported member 'createCustomAdminHooks'.
+```
+
+This is because a previous version of `medusa-react` allowed creating custom hooks using `createCustomAdminHooks`. This has now changed to use different utility hooks, which you can learn about [the Medusa React documentation](../medusa-react/overview.mdx#custom-hooks).
+
+To resolve this issue, you have the following options:
+
+1. If you haven't used `createCustomAdminHooks` in your code, then you can delete the content of the `src/admin` directory which holds the widgets that create your onboarding flow, then try running your Medusa backend.
+2. If you've used the `createCustomAdminHooks` in your code, refer to the [Medusa React](../medusa-react/overview.mdx#custom-hooks) to learn about the new utility hooks and how you can use them.
+

docs/content/troubleshooting/eaddrinuse.md

@@ -0,0 +1,18 @@
+---
+title: 'EADDRINUSE Error'
+---
+
+When you run your backend you may run to an error similar to the following:
+
+```bash
+code: 'EADDRINUSE',
+errno: -48,
+syscall: 'Listen',
+address: '::',
+port: 9000
+```
+
+This means that there's another process running at port `9000`. You need to either:
+
+- Change the default port used by the Medusa backend. You can do that by setting the `PORT` environment variable to a new port. When you do this, make sure to change the port used in other apps that interact with your Medusa backend, such as in your [admin](../admin/quickstart.mdx#build-command-options) or [storefront](../starters/nextjs-medusa-starter.mdx#changing-medusa-backend-url).
+- Terminate other processes running on port `9000`.