Cannot send test request. Reason: minimal?

Hi everyone. Does anyone know what this means? This is the first time I have encountered it. I am sending a very simple GET request with an Accept header of application/json. I assume something is missing but have no idea what. The same request works in Postman

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The details button reveals the following:

(Stack trace: java.nio.charset.UnsupportedCharsetException: minimal

at java.nio.charset.Charset.forName(

at com.kms.katalon.core.testobject.impl.HttpTextBodyContent.(

at com.kms.katalon.core.webservice.common.BasicRequestor.setBodyContent(

at com.kms.katalon.core.webservice.common.RestfulClient.response(

at com.kms.katalon.core.webservice.common.RestfulClient.sendGetRequest(

at com.kms.katalon.core.webservice.common.RestfulClient.send(

at com.kms.katalon.controller.WebServiceController.sendRequest(


at org.eclipse.jface.operation.ModalContext$


Just to add one more detail: the error occurs in Katalon 5.4.1 … the same request is successful in Kataon 5.3.1