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+# Welcome to the weather-app wiki!
+
+This web application is one of my first ones that I have build.
+
+> This application is still work in progress.
+> So be paitiend with me, if the app has still some errors.
+> If you notice one, please create a new issue and I will take care of that.
+
+## Error codes
+
+Here you will find help when you get an error message. The error code should be next to the error starting with an ```x```.
+
+## x30
+
+***For developers:** This error is triggered from the ```frontend/src/utils/changeAPIcookie.ts``` file*
+
+This error you will get, when there is something wrong with setting your API key. Please create an issue if you get this error.
+
+To fix this error you can try to add the api key manually to your cookies. Follow these steps:
+
+1. Naviagte to the cookies tab in your browser
+2. Create an cookie with name `apiKey` and in the value paste your api key.
+
+This should fix your problem!
+
+## x32
+
+***For developers:** This error is triggered from the ```frontend/src/utils/apiFunc.ts``` file*
+
+When you get this error please create an issue and I will take care of that error.
+
+For now, try to reinstall the application.
+
+## x4010
+
+***For developers:** This error is triggered from the ```frontend/src/utils/apiFunc.ts``` file*
+
+When you get this error, the api function is having trouble with you api key.
+
+To fix this error, check the api key that you have entered.
+
+* Do not put spaces between the letters
+* Check if you have pasted the api key from OpenWeatherMap correctly. (The free api key is completely sufficient)
+
+If this does not work, try to make an api call by yourself (e.g. with Postman). Or get in touch personally with OpenWeatherMap
+
+## x4040
+
+***For developers:** This error is triggered from the ```frontend/src/components/WeatherForm.tsx``` file*
+
+If you get this error you have entered a city name that cannot be geocoded to longitudes and latitudes.
+
+Try to enter a different one.