# Katalon unable to load its own core Web Service library that defines ResponseObject **URL:** \ **Category:** Miscellaneous\ **Created:** [July 24, 2025, 2:40pm UTC](https://forum.katalon.com/t/katalon-unable-to-load-its-own-core-web-service-library-that-defines-responseobject/179075 "2025-07-24T14:40:23Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![rathivishal19](https://dub1.discourse-cdn.com/katalon/user_avatar/forum.katalon.com/rathivishal19/32/30227_2.png) [@rathivishal19](https://forum.katalon.com/u/rathivishal19)\ **Post date:** [July 24, 2025, 2:40pm UTC](https://forum.katalon.com/t/katalon-unable-to-load-its-own-core-web-service-library-that-defines-responseobject/179075/1 "2025-07-24T14:40:23Z")
Hi Team, I am trying to provide same variable for web and API request and i have imported this web service library “import com.kms.katalon.core.webservice.model.ResponseObject” While running the test i am facing below error groovy: 1: unable to resolve class com.kms.katalon.core.webservice.model.ResponseObject @ line 1, column 1. import com.kms.katalon.core.webservice.model.ResponseObject ^ 1 error ``` at com.kms.katalon.core.main.ScriptEngine.getScript(ScriptEngine.java:199) 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:448) at com.kms.katalon.core.main.TestCaseExecutor.doExecute(TestCaseExecutor.java:439) at com.kms.katalon.core.main.TestCaseExecutor.processExecutionPhase(TestCaseExecutor.java:418) at com.kms.katalon.core.main.TestCaseExecutor.accessMainPhase(TestCaseExecutor.java:410) at com.kms.katalon.core.main.TestCaseExecutor.execute(TestCaseExecutor.java:285) at com.kms.katalon.core.main.TestCaseMain.runTestCase(TestCaseMain.java:137) at com.kms.katalon.core.main.TestCaseMain.runTestCase(TestCaseMain.java:128) at TempTestCase1753363114564.run(TempTestCase1753363114564.groovy:25) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ``` 2025-07-24 18:48:35.628 INFO c.k.katalon.core.main.TestCaseExecutor - END Test Cases/responseobject I tried doing everything but Katalon doesn’t appear to take load its own core Web Service library that defines ResponseObject. For sample test i am just using these two line code and its giving me error. Can anyone help with the solution please ? ![image](https://europe1.discourse-cdn.com/katalon/original/3X/f/2/f283e184fee5930b0c4393f25a84af06bb799956.jpeg) ---
**Author:** ![kazurayam](https://dub1.discourse-cdn.com/katalon/user_avatar/forum.katalon.com/kazurayam/32/333_2.png) [@kazurayam](https://forum.katalon.com/u/kazurayam)\ **Post date:** [July 24, 2025, 11:17pm UTC](https://forum.katalon.com/t/katalon-unable-to-load-its-own-core-web-service-library-that-defines-responseobject/179075/2 "2025-07-24T23:17:53Z")
Wrong: > [@rathivishal19](#): > > import com.kms.katalon.core.webservice.model.ResponseObject > ^ `com.kms.katalon.core.webservice.model` — there is no such package defined in the [Katalon Studio API](https://api-docs.katalon.com/overview-summary.html). Possibly you want: ```auto import com.kms.katalon.core.testobject.ResponseObject ``` ---
**Author:** ![rathivishal19](https://dub1.discourse-cdn.com/katalon/user_avatar/forum.katalon.com/rathivishal19/32/30227_2.png) [@rathivishal19](https://forum.katalon.com/u/rathivishal19)\ **Post date:** [July 25, 2025, 7:36am UTC](https://forum.katalon.com/t/katalon-unable-to-load-its-own-core-web-service-library-that-defines-responseobject/179075/3 "2025-07-25T07:36:37Z")
Thanks i tried the shared import and it worked. ---
**Author:** ![kazurayam](https://dub1.discourse-cdn.com/katalon/user_avatar/forum.katalon.com/kazurayam/32/333_2.png) [@kazurayam](https://forum.katalon.com/u/kazurayam)\ **Post date:** [July 28, 2025, 10:21am UTC](https://forum.katalon.com/t/katalon-unable-to-load-its-own-core-web-service-library-that-defines-responseobject/179075/4 "2025-07-28T10:21:30Z")
> [@rathivishal19](#): > > groovy: 1: unable to resolve class com.kms.katalon.core.webservice.model.ResponseObject > @ line 1, column 1. > import com.kms.katalon.core.webservice.model.ResponseObject > ^ I wonder why @rathivishal19 got the fake fully-qualified-class-name `com.kms.katalon.core.webservice.model.ResponseObject`, which does not actually exists. To me, it seems to be a hallucination of AI. Did you copy&paste a code fragment advised by some AI service? Was it StudioAssist of Katalon? Or anything else like ChaptGPT? ---
**Author:** ![rathivishal19](https://dub1.discourse-cdn.com/katalon/user_avatar/forum.katalon.com/rathivishal19/32/30227_2.png) [@rathivishal19](https://forum.katalon.com/u/rathivishal19)\ **Post date:** [July 29, 2025, 4:42am UTC](https://forum.katalon.com/t/katalon-unable-to-load-its-own-core-web-service-library-that-defines-responseobject/179075/5 "2025-07-29T04:42:27Z")
Yes i used an AI like ChatGPT which told me to use that package. ---
**Author:** ![kazurayam](https://dub1.discourse-cdn.com/katalon/user_avatar/forum.katalon.com/kazurayam/32/333_2.png) [@kazurayam](https://forum.katalon.com/u/kazurayam)\ **Post date:** [July 29, 2025, 4:55am UTC](https://forum.katalon.com/t/katalon-unable-to-load-its-own-core-web-service-library-that-defines-responseobject/179075/6 "2025-07-29T04:55:00Z")
@rathivishal19 Thank you for your reply. In your case, we witnessed that AI often makes mistakes.