Set text not working?

Hi

Newbie question - Any ideas why set text might not be working? I can complete the same action manually and record it, but on replay it errors. Any test case im running with set text now errors.

Test Cases/XXXXXXX/Front page search shows search term in results FAILED.
Reason:
com.kms.katalon.core.exception.StepFailedException: Unable to set text (Root cause: java.lang.IllegalArgumentException: Object is null)
at com.kms.katalon.core.keyword.internal.KeywordMain.stepFailed(KeywordMain.groovy:36)
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.SetTextKeyword.setText(SetTextKeyword.groovy:65)
at com.kms.katalon.core.webui.keyword.builtin.SetTextKeyword.execute(SetTextKeyword.groovy:37)
at com.kms.katalon.core.keyword.internal.KeywordExecutor.executeKeywordForPlatform(KeywordExecutor.groovy:53)
at com.kms.katalon.core.webui.keyword.WebUiBuiltInKeywords.setText(WebUiBuiltInKeywords.groovy:950)
at com.kms.katalon.core.webui.keyword.WebUiBuiltInKeywords$setText.call(Unknown Source)
at Front page search shows search term in results.run(Front page search shows search term in results:17)
at com.kms.katalon.core.main.ScriptEngine.run(ScriptEngine.java:194)
at com.kms.katalon.core.main.ScriptEngine.runScriptAsRawText(ScriptEngine.java:119)
at com.kms.katalon.core.main.TestCaseExecutor.runScript(TestCaseExecutor.java:328)
at com.kms.katalon.core.main.TestCaseExecutor.doExecute(TestCaseExecutor.java:319)
at com.kms.katalon.core.main.TestCaseExecutor.processExecutionPhase(TestCaseExecutor.java:298)
at com.kms.katalon.core.main.TestCaseExecutor.accessMainPhase(TestCaseExecutor.java:290)
at com.kms.katalon.core.main.TestCaseExecutor.execute(TestCaseExecutor.java:224)
at com.kms.katalon.core.main.TestCaseMain.runTestCase(TestCaseMain.java:106)
at com.kms.katalon.core.main.TestCaseMain.runTestCase(TestCaseMain.java:97)
at com.kms.katalon.core.main.TestCaseMain$runTestCase$0.call(Unknown Source)
at TempTestCase1545226439759.run(TempTestCase1545226439759.groovy:22)

This is the error. Please share your code and show the test object you use for input field.