Unable to automate a login window

I am using 5.6.1.
I am using the Katalon Studio to do my automation.
My application is using DHTMLx as its underlying tool set
When I do my automation, it does record the user name and password being typed in
However, during play back it does not find the fields to type the value in.
I get this message during play back–
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08-23-2018 06:51:53 AM - [FAILED] - Unable to set text ‘admin’ of object ‘Page_SCHEDULE/input_username_1’ (Root cause: com.kms.katalon.core.webui.exception.WebElementNotFoundException: Web element with id: ‘Page_SCHEDULE/input_username_1’ located by ‘By.xpath: //input[@name = ‘username’ and @id = ‘dhxId_Aj9SuaxcQjLI’ and @type = ‘TEXT’]’ not found)

08-23-2018 06:51:53 AM - [FAILED] - Verification FAILED because (of) Unable to set text ‘admin’ of object ‘Page_SCHEDULE/input_username_1’ (Root cause: com.kms.katalon.core.webui.exception.WebElementNotFoundException: Web element with id: ‘Page_SCHEDULE/input_username_1’ located by ‘By.xpath: //input[@name = ‘username’ and @id = ‘dhxId_Aj9SuaxcQjLI’ and @type = ‘TEXT’]’ not found)
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Any suggestions

Hi Kevin

The part that reads dhxId_Aj9SuaxcQjLI looks like a dynamic id. Try excluding that from the xpath and rerun the test.