React native – I can't connect the react-native in my cellphone

I already connected my cell phone to the USB cable and checked the prompt that the device was showing,
but when I use the npm start command and choose the android one it gives this error:
info JS server already running.

info 💡 Tip: Make sure that you have set up your development environment correctly, by running react-native doctor. To read more about doctor command visit: https://github.com/react-native-community/cli/blob/main/packages/cli-doctor/README.md#doctor

FAILURE: Build failed with an exception.

• What went wrong:
  A problem occurred configuring root project ‘Nativjsestudar’.

Could not determine the dependencies of null.
Could not resolve all task dependencies for configuration ‘:classpath’.
> Could not find com.android.tools.build:gradle:.
Required by:
project :
> Could not resolve com.facebook.react:react-native-gradle-plugin.
Required by:
project :
> No matching variant of project :gradle-plugin was found. The consumer was configured to find a library for use during runtime,
compatible with Java 8, packaged as a jar, and its dependencies declared externally, as well as attribute ‘org.gradle.plugin.api-version’
with value ‘8.0.1’ but:
– Variant ‘apiElements’ capability com.facebook.react:react-native-gradle-plugin:unspecified declares a library, packaged as
a jar, and its dependencies declared externally:
– Incompatible because this component declares a component for use during compile-time, compatible with Java 11 and the consumer needed a component for use during runtime, compatible with Java 8
– Other compatible attribute:
– Doesn’t say anything about org.gradle.plugin.api-version (required ‘8.0.1’)
– Variant ‘mainSourceElements’ capability com.facebook.react:react-native-gradle-plugin:unspecified declares a component, and its dependencies declared externally:
– Incompatible because this component declares a component of category ‘verification’ and the consumer needed a library
– Other compatible attributes:
– Doesn’t say anything about its target Java version (required compatibility with Java 8)
– Doesn’t say anything about its elements (required them packaged as a jar)
– Doesn’t say anything about org.gradle.plugin.api-version (required ‘8.0.1’)
– Doesn’t say anything about its usage (required runtime)
uring runtime, packaged as a jar, and its dependencies declared externally:
– Incompatible because this component declares a component, compatible with Java 11 and the consumer needed a component,
compatible with Java 8
– Other compatible attribute:
– Doesn’t say anything about org.gradle.plugin.api-version (required ‘8.0.1’)
– Variant ‘testResultsElementsForTest’ capability com.facebook.react:react-native-gradle-plugin:unspecified:
– Incompatible because this component declares a component of category ‘verification’ and the consumer needed a library
– Other compatible attributes:
– Doesn’t say anything about its target Java version (required compatibility with Java 8)
– Doesn’t say anything about its elements (required them packaged as a jar)
– Doesn’t say anything about org.gradle.plugin.api-version (required ‘8.0.1’)
– Doesn’t say anything about its usage (required runtime)

• Try:

Run with –stacktrace option to get the stack trace.
Run with –info or –debug option to get more log output.

• Get more help at https://help.gradle.org

I’m new in react and i’m trying to do this if you can help me some how, i will be glad thanks

I just want connect to my device