When i run the test case with firefox getting error: Please give me a solution

Unable to open browser with url: ‘https://www.katalon.com/’ (Root cause: org.openqa.selenium.UnhandledAlertException: :

Build info: version: ‘3.7.1’, revision: ‘8a0099a’, time: ‘2017-11-06T21:07:36.161Z’

System info: host: ‘THUSHARI-001L’, ip: ‘’, os.name: ‘Windows 10’, os.arch: ‘amd64’, os.version: ‘10.0’, java.version: ‘1.8.0_102’

Driver info: com.kms.katalon.core.webui.driver.firefox.CGeckoDriver

Capabilities {acceptInsecureCerts: true, browserName: firefox, browserVersion: 59.0.3, javascriptEnabled: true, moz:accessibilityChecks: false, moz:headless: false, moz:processID: 15864, moz:profile: C:\Users\rangana_jkcs\AppDa…, moz:useNonSpecCompliantPointerOrigin: false, moz:webdriverClick: true, pageLoadStrategy: normal, platform: XP, platformName: XP, platformVersion: 10.0, proxy: Proxy(manual, ftp=proxy.dia…, rotatable: false, timeouts: {implicit: 0, pageLoad: 300000, script: 30000}}

Session ID: 998cfb0c-8687-4ab2-9fbe-346185aa14e5)