Some Common Errors During React-Native Project Run 



👉 Error. 1)    How to Solve Error  unable to resolve dependency tree during running            command npm install 

Solution :  npm install --legacy-peer-deps   

This command will help you to install all peer dependencies


👉Error. 2)  Whenever you get any unexpected error 

Solution : Try cd android && ./gradlew clean   then cd.. npm cache clean --force    then react-native run-android This will unistall debug and anykind of keystore previously generate too . So be aware before performing this step .


👉Error.3)   Could not determine the dependencies of task ':app:installDebug'.

> SDK location not found. Define location with an ANDROID_SDK_ROOT environment variable or by setting the sdk.dir path in your project's local properties file at 'C:\Users\Username\react native projects\Project_name\android\local.properties'.


Solution : This error occurs when you do not have local.properties file in 'C:\Users\Username\react native projects\Project_name\android\' 

create a file called local.properties at  'C:\Users\Username\react native projects\Project_name\android\'  

add line 

sdk.dir = C:\\Users\\Username\\AppData\\Local\\Android\\Sdk 


👉Error .4) > Task :app:installDebug FAILED

Skipping device 'RZ8N90DZ5FB' (RZ8N90DZ5FB): Device is OFFLINE.

Solution : This error arises when your connected device through USB is offline . Try Restarting your phone or disable and enable back usb debugging option 


👉Error. 5) return new RegExp(

         ^


SyntaxError: Invalid regular expression: /(.*\\__fixtures__\\.*|node_modules[\\\]react[\\\]dist[\\\].*|website\\node_modules\\.*|heapCapture\\bundle\.js|.*\\__tests__\\.*)$/: Unterminated character class 


in file blacklist.js

Solution : you have to make change in this file {project_root}\node_modules\metro-config\src\defaults\blacklist.js

there is an invalid regular expression that needed changed. I changed the first expression under sharedBlacklist from:



var sharedBlacklist = [
 /node_modules[/\\]react[/\\]dist[/\\].*/,
 /website\/node_modules\/.*/,
 /heapCapture\/bundle\.js/,
 /.*\/__tests__\/.*/
];

to

var sharedBlacklist = [
/node_modules[\/\\]react[\/\\]dist[\/\\].*/,
/website\/node_modules\/.*/,
/heapCapture\/bundle\.js/,
/.*\/__tests__\/.*/
];