One of the autogenerated files (R file) is showing missing while building the project.
ext.kotlin_version = "1.5.0"
classpath 'com.android.tools.build:gradle:4.2.0'
compileSdkVersion 30 buildToolsVersion "30.0.2"
minSdkVersion 21 targetSdkVersion 30
Answer Update :
The Antivirus was interfering and capturing the autogenerated file as false positive. Ignoring the file or Add to exception or Allowing the Program in antivirus solved the problem.