openBrowser(URL) FAILED. Reason: com.kms.katalon.core.exception.StepFailedException: Unable to open browser with url

07-19-2019 06:55:57 PM openBrowser(URL)

Elapsed time: 0.306s

openBrowser(URL) FAILED.
Reason:
com.kms.katalon.core.exception.StepFailedException: Unable to open browser with url: ‘http://portal.neptune.unibiz.com/login/qaav
at com.kms.katalon.core.keyword.internal.KeywordMain.stepFailed(KeywordMain.groovy:48)
at com.kms.katalon.core.webui.keyword.internal.WebUIKeywordMain.stepFailed(WebUIKeywordMain.groovy:65)
at com.kms.katalon.core.webui.keyword.internal.WebUIKeywordMain.runKeyword(WebUIKeywordMain.groovy:27)
at com.kms.katalon.core.webui.keyword.builtin.OpenBrowserKeyword.openBrowser(OpenBrowserKeyword.groovy:81)
at com.kms.katalon.core.webui.keyword.builtin.OpenBrowserKeyword.execute(OpenBrowserKeyword.groovy:67)
at com.kms.katalon.core.keyword.internal.KeywordExecutor.executeKeywordForPlatform(KeywordExecutor.groovy:56)
at com.kms.katalon.core.webui.keyword.WebUiBuiltInKeywords.openBrowser(WebUiBuiltInKeywords.groovy:60)
at com.kms.katalon.core.webui.keyword.WebUiBuiltInKeywords$openBrowser.call(Unknown Source)
at CreateCustomer.run(CreateCustomer:16)
at com.kms.katalon.core.main.ScriptEngine.run(ScriptEngine.java:194)
at com.kms.katalon.core.main.ScriptEngine.runScriptAsRawText(ScriptEngine.java:119)
at com.kms.katalon.core.main.TestCaseExecutor.runScript(TestCaseExecutor.java:331)
at com.kms.katalon.core.main.TestCaseExecutor.doExecute(TestCaseExecutor.java:322)
at com.kms.katalon.core.main.TestCaseExecutor.processExecutionPhase(TestCaseExecutor.java:301)
at com.kms.katalon.core.main.TestCaseExecutor.accessMainPhase(TestCaseExecutor.java:293)
at com.kms.katalon.core.main.TestCaseExecutor.execute(TestCaseExecutor.java:227)
at com.kms.katalon.core.main.TestSuiteExecutor.accessTestCaseMainPhase(TestSuiteExecutor.java:129)
at com.kms.katalon.core.main.TestSuiteExecutor.accessTestSuiteMainPhase(TestSuiteExecutor.java:112)
at com.kms.katalon.core.main.TestSuiteExecutor.execute(TestSuiteExecutor.java:81)
at com.kms.katalon.core.main.TestCaseMain.startTestSuite(TestCaseMain.java:157)
at com.kms.katalon.core.main.TestCaseMain$startTestSuite$0.call(Unknown Source)
at TempTestSuite1563542754126.run(TempTestSuite1563542754126.groovy:35)

when i run test suit it works fine but when run test suit collection gets above error. Please help i am using
Katalon Studio
Version: 6.0.5
Build: 10