Parklocater class did not achieve 100 % code coverage via your test method.make sure that you choose run all tests in the developer console at least once before attempting to verify this challenge

 Run your test class from Developer Console --> Test --> Run All first. Make sure the Parklocater class reaches 100% coverage and there are no test failures. After that, return to Trailhead and click Check Challenge again. Also verify that your test method covers all executable lines in the Parklocater class.