Its about gradle

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1 
What went wrong:
Plugin [id: 'com.android.application', version: '{7.3.0}', apply: false] was not found in any of the following sources:

- Gradle Core Plugins (plugin is not in 'org.gradle' namespace)
- Included Builds (None of the included builds contain this plugin)
- Plugin Repositories (could not resolve plugin artifact 'com.android.application:com.android.application.gradle.plugin:{7.3.0}')
  Searched in the following repositories:
    Google
    MavenRepo
    Gradle Central Plugin Repository

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2

Delete the curly braces around the version.