LiveLink for MATLAB

when I run the program from MATLAB, the run are usually errors with message shown below, please any help or hint

Error using A (line 165) Java exception occurred: Exception: com.comsol.util.exceptions.FlException: X can be:#Selection (rethrown as com.comsol.util.exceptions.FlException) (rethrown as com.comsol.util.exceptions.FlException) Messages: X can be:#Selection

X can be:#Selection

Invalid property value.

'Selection' can be.:

A string
- : ""

An integer
- : "1"
- Property: solnum

Stack trace:

at com.comsol.clientapi.engine.c.handleException(Unknown Source)

at com.comsol.client.interfaces.f$d.e(Unknown Source)

at com.comsol.client.interfaces.f.a(Unknown Source)

at com.comsol.client.interfaces.f.runAndWait(Unknown Source)

at com.comsol.clientapi.engine.APIEngine.runMethod(Unknown Source)

at com.comsol.clientapi.impl.PropFeatureClient.set(Unknown Source)

Caused by: Exception: com.comsol.util.exceptions.FlException: X can be:#Selection (rethrown as com.comsol.util.exceptions.FlException) Messages: X can be:#Selection

Invalid property value.

'Selection' can be.:

A string
- : ""

An integer
- : "1"
- Property: solnum


at com.comsol.clientapi.engine.c.handleException(Unknown Source)

at com.comsol.client.interfaces.f.a(Unknown Source)

at com.comsol.client.interfaces.f.processCommandAnswer(Unknown Source)

... 5 more

Caused by: Exception: com.comsol.util.exceptions.FlException: X can be:#Selection Messages: Invalid property value.

'Selection' can be.:

A string
- : ""

An integer
- : "1"
- Property: solnum


at com.comsol.nativeutil.properties.j.i_(Unknown Source)

at com.comsol.nativeutil.properties.j.set(Unknown Source)

at com.comsol.model.method.PropValueUtil.propertySet(Unknown Source)

at com.comsol.model.internal.impl.PropValueImpl.set(Unknown Source)

at com.comsol.model.internal.impl.PropFeatureImpl.d(Unknown Source)

at com.comsol.model.internal.impl.ResultFeatureImpl.d(Unknown Source)

at com.comsol.model.internal.impl.PropFeatureImpl.c(Unknown Source)

at com.comsol.model.internal.impl.PropFeatureImpl$2.a(Unknown Source)

at com.comsol.model.internal.impl.PropFeatureImpl$2.execute(Unknown Source)

at com.comsol.model.clientserver.ClientManager$1.call(Unknown Source)

at java.util.concurrent.FutureTask.run(Unknown Source)

at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

at java.lang.Thread.run(Unknown Source)