TID: [-1234] [] [2022-03-22 10:29:37,617] ERROR {API_LOGGER._WSO2AMTokenAPI_} -  Error while building message. Error while building Passthrough stream {API_LOGGER._WSO2AMTokenAPI_}
org.apache.axis2.AxisFault: Error while building Passthrough stream
                at org.apache.synapse.transport.passthru.util.RelayUtils.handleException(RelayUtils.java:428)
                at org.apache.synapse.transport.passthru.util.RelayUtils.builldMessage(RelayUtils.java:213)
                at org.apache.synapse.transport.passthru.util.RelayUtils.buildMessage(RelayUtils.java:122)
                at org.apache.synapse.mediators.AbstractListMediator.buildMessage(AbstractListMediator.java:145)
                at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:94)
                at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:70)
                at org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:158)
                at org.wso2.carbon.apimgt.gateway.handlers.ext.APIManagerCacheExtensionHandler.mediate_aroundBody0(APIManagerCacheExtensionHandler.java:37)
                at org.wso2.carbon.apimgt.gateway.handlers.ext.APIManagerCacheExtensionHandler.mediate(APIManagerCacheExtensionHandler.java:30)
                at org.wso2.carbon.apimgt.gateway.handlers.ext.APIManagerCacheExtensionHandler.handleResponse_aroundBody10(APIManagerCacheExtensionHandler.java:144)
                at org.wso2.carbon.apimgt.gateway.handlers.ext.APIManagerCacheExtensionHandler.handleResponse(APIManagerCacheExtensionHandler.java:142)
                at org.apache.synapse.rest.API.process(API.java:341)
                at org.apache.synapse.rest.RESTRequestHandler.apiProcess(RESTRequestHandler.java:123)
                at org.apache.synapse.rest.RESTRequestHandler.dispatchToAPI(RESTRequestHandler.java:101)
                at org.apache.synapse.rest.RESTRequestHandler.process(RESTRequestHandler.java:56)
                at org.apache.synapse.core.axis2.Axis2SynapseEnvironment.injectMessage(Axis2SynapseEnvironment.java:303)
                at org.apache.synapse.core.axis2.SynapseCallbackReceiver.handleMessage(SynapseCallbackReceiver.java:574)
                at org.apache.synapse.core.axis2.SynapseCallbackReceiver.receive(SynapseCallbackReceiver.java:193)
                at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180)
                at org.apache.synapse.transport.passthru.ClientWorker.run(ClientWorker.java:263)
                at org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:172)
                at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
                at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
                at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.axis2.AxisFault: #Can not parse stream. MessageID: urn:uuid:e071e5f2-89c9-49a1-a3fa-7ddb38c4e197. Error>>> #getNewJsonPayload. Could not save JSON payload. Invalid input stream found. Payload is not a JSON string.
                at org.apache.synapse.commons.json.JsonUtil.getNewJsonPayload(JsonUtil.java:652)
                at org.apache.synapse.commons.json.JsonStreamBuilder.processDocument(JsonStreamBuilder.java:43)
                at org.apache.synapse.transport.passthru.util.DeferredMessageBuilder.getDocument(DeferredMessageBuilder.java:153)
                at org.apache.synapse.transport.passthru.util.RelayUtils.builldMessage(RelayUtils.java:169)
                ... 22 more
Caused by: org.apache.axis2.AxisFault: #getNewJsonPayload. Could not save JSON payload. Invalid input stream found. Payload is not a JSON string.
                at org.apache.synapse.commons.json.JsonUtil.getNewJsonPayload(JsonUtil.java:642)
                ... 25 more