add in root (#2395)

README.md

@@ -561,6 +561,8 @@ This version comes with the bare minimum amount of features and functionalities
 | [React](https://github.com/microsoft/applicationinsights-react-js) | [![npm version](https://badge.fury.io/js/%40microsoft%2Fapplicationinsights-react-js.svg)](https://www.npmjs.com/package/@microsoft/applicationinsights-react-js)
 | [React Native](https://github.com/microsoft/applicationinsights-react-native) | [![npm version](https://badge.fury.io/js/%40microsoft%2Fapplicationinsights-react-native.svg)](https://www.npmjs.com/package/@microsoft/applicationinsights-react-native)
 
+Click here for a [Type Error Fixed Guideline](https://microsoft.github.io/ApplicationInsights-JS/ExtensionErrorSteps)
+
 ## Build a new extension for the SDK
 
 The SDK supports the ability to include multiple extensions at runtime. In order to create a new extension, please implement the following interface:

docs/ExtensionErrorSteps.md

@@ -0,0 +1,38 @@
+# Investigating and Solving Plugin-Type Errors in Extensions
+
+This guide addresses plugin-type errors encountered when using the `applicationinsights-web` package alongside other extensions, such as `@microsoft/applicationinsights-react-js`, `@microsoft/applicationinsights-react-native`, and `@microsoft/applicationinsights-angularplugin-js`.
+
+## Overview
+
+A common error message associated with these issues might look like this:
+
+```plaintext
+Type 'ReactPlugin' is not assignable to type 'ITelemetryPlugin'.
+```
+
+Plugin-type errors often arise due to version mismatches between applicationinsights-web and its extensions.
+
+## Reason 
+
+When a new version of applicationinsights-web (which includes applicationinsights-core as a dependency) is released, package management tools may automatically update applicationinsights-core to the new version. However, if the extensions (e.g., React, Angular) have not been updated, their dependencies on applicationinsights-core may not match, leading to type errors.
+
+## Steps to Investigate and Solve Plugin-Type Errors
+
+### 1. Verify Package Versions
+
+- **Check Dependencies**: Ensure that you have compatible versions of applicationinsights-common, applicationinsights-core, and any other related libraries. Look for discrepancies in your yarn.lock or package-lock.json or node_modules folder. 
+![alt text](./media/pluginType.png)
+
+### 2. Perform a Complete Update
+The easiest way to ensure all dependencies are updated is to delete the node_modules folder and reinstall the packages:
+```
+rm -rf node_modules
+npm install
+```
+### 3. Examples to follow
+Here is a discussion that provide deeper insights into resolving these issues:
+https://github.com/microsoft/applicationinsights-react-js/issues/95
+
+
+
+