Mule SAX parse exception during deployment - mule-studio

Question

I am getting the below exception in Anypoint studio with same HttpListener
Using the below runtime environment.
Runtime: 4.1.4
Any pointIDE :7.4.2
Is there any compatibility between the IDE and runtime?
Any suggestion on this?
Thanks.
Initializing app 'firstmule' +
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INFO 2020-02-24 12:04:51,481 [WrapperListener_start_runner] [event: ] org.mule.runtime.module.extension.internal.manager.DefaultExtensionManager: Registering extension ee (version: 4.1.4 vendor: MuleSoft, Inc. )
INFO 2020-02-24 12:04:51,481 [WrapperListener_start_runner] [event: ] org.mule.runtime.module.extension.internal.manager.DefaultExtensionManager: Registering extension mule (version: 4.1.4 vendor: MuleSoft, Inc. )
INFO 2020-02-24 12:04:55,990 [WrapperListener_start_runner] [event: ] org.mule.runtime.module.extension.internal.manager.DefaultExtensionManager: Registering extension Sockets (version: 1.1.5 vendor: Mulesoft )
INFO 2020-02-24 12:04:55,993 [WrapperListener_start_runner] [event: ] org.mule.runtime.module.extension.internal.manager.DefaultExtensionManager: Registering extension HTTP (version: 1.5.6 vendor: Mulesoft )
INFO 2020-02-24 12:04:59,750 [WrapperListener_start_runner] [event: ] org.mule.runtime.core.privileged.lifecycle.AbstractLifecycleManager: Disposing RegistryBroker
ERROR 2020-02-24 12:04:59,750 [WrapperListener_start_runner] [event: ] org.mule.runtime.module.deployment.impl.internal.application.DefaultMuleApplication: null
org.mule.runtime.api.exception.MuleRuntimeException: There was '1' error while parsing the given file 'firstmule.xml'.
Full list:
org.xml.sax.SAXParseException; lineNumber: 12; columnNumber: 9; cvc-complex-type.2.4.b: The content of element 'flow' is not complete. One of '{"http://www.mulesoft.org/schema/mule/core":abstract-message-processor, "http://www.mulesoft.org/schema/mule/core":abstract-mixed-content-message-processor}' is expected.
INFO 2020-02-24 12:04:59,765 [WrapperListener_start_runner] [event: ] org.mule.runtime.module.deployment.impl.internal.application.DefaultMuleApplication: App 'firstmule' never started, nothing to dispose of
ERROR 2020-02-24 12:04:59,781 [WrapperListener_start_runner] org.mule.runtime.module.deployment.internal.DefaultArchiveDeployer:
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+ Failed to deploy artifact 'firstmule', see below +
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org.mule.runtime.deployment.model.api.DeploymentException: Failed to deploy artifact [firstmule]
Caused by: org.mule.runtime.api.exception.MuleRuntimeException: org.mule.runtime.deployment.model.api.DeploymentInitException: MuleRuntimeException: There was '1' error while parsing the given file 'firstmule.xml'.
Full list:
org.xml.sax.SAXParseException; lineNumber: 12; columnNumber: 9; cvc-complex-type.2.4.b: The content of element 'flow' is not complete. One of '{"http://www.mulesoft.org/schema/mule/core":abstract-message-processor, "http://www.mulesoft.org/schema/mule/core":abstract-mixed-content-message-processor}' is expected.
Caused by: org.mule.runtime.deployment.model.api.DeploymentInitException: MuleRuntimeException: There was '1' error while parsing the given file 'firstmule.xml'.
Full list:
org.xml.sax.SAXParseException; lineNumber: 12; columnNumber: 9; cvc-complex-type.2.4.b: The content of element 'flow' is not complete. One of '{"http://www.mulesoft.org/schema/mule/core":abstract-message-processor, "http://www.mulesoft.org/schema/mule/core":abstract-mixed-content-message-processor}' is expected.
Caused by: org.mule.runtime.core.api.config.ConfigurationException: There was '1' error while parsing the given file 'firstmule.xml'.
Full list:
org.xml.sax.SAXParseException; lineNumber: 12; columnNumber: 9; cvc-complex-type.2.4.b: The content of element 'flow' is not complete. One of '{"http://www.mulesoft.org/schema/mule/core":abstract-message-processor, "http://www.mulesoft.org/schema/mule/core":abstract-mixed-content-message-processor}' is expected.
Caused by: org.mule.runtime.api.exception.MuleRuntimeException: There was '1' error while parsing the given file 'firstmule.xml'.
Full list:
org.xml.sax.SAXParseException; lineNumber: 12; columnNumber: 9; cvc-complex-type.2.4.b: The content of element 'flow' is not complete. One of '{"http://www.mulesoft.org/schema/mule/core":abstract-message-processor, "http://www.mulesoft.org/schema/mule/core":abstract-mixed-content-message-processor}' is expected.
INFO 2020-02-24 12:04:59,781 [WrapperListener_start_runner] org.mule.runtime.module.deployment.internal.DeploymentDirectoryWatcher:
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+ Mule is up and kicking (every 5000ms) +
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INFO 2020-02-24 12:05:00,731 [WrapperListener_start_runner] org.eclipse.jetty.server.AbstractConnector: Started ServerConnector#44510ad1{HTTP/1.1,[http/1.1]}{0.0.0.0:56978}
INFO 2020-02-24 12:05:00,731 [WrapperListener_start_runner]

Answer 1

Guess you have already sorted it out but based on the error, seems like the Mule app does not have any connector in the flow "process area".
Thus, the Mule app will fail because it just contain an HTTP Listener connector in the flow "source area".
By adding for instance, a "Log" connector or a "Se Payload" connector on the right of the HTTP Listener, the flow "process area" wont be empty, and therefore the Mule app will be able to deploy and run successfully.