Since you haven't shared any code or much details as to what you've done the only assumption that I can make is you have done something wrong in your testrunner class.
@RunWith(Cucumber.class)
@CucumberOptions(
features = "Feature"
,glue={"stepDefinition"}
)
public class TestRunner {
}
in the features make sure the path to your feature files is correct. i.e. if they are stored at some other directory, provide the path for the same
Ex: features = {"src/test/java/features"}
Also, please share your project structure, your feature file and your testrunner class code if possible in case this doesn't work for you.