"Cannot find a default KieSession" error when sending request to Decision Server

Issue

Following POST request is being sent to the Decision Server:

POST http://localhost:8080/kie-server/services/rest/server/containers/mortgage 

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<batch-execution>
  <insert out-identifier="inserter" return-object="true" entry-point="DEFAULT">
    <org.MtgAmountRequestedFacts>
      <creditReferenceNumber>5104560000001</creditReferenceNumber>
      <purchasePrice>500000.0</purchasePrice>
      <downPayment>50000.0</downPayment>
      <otherFinancingAmount>10000.0</otherFinancingAmount>
      <amountRequested>0.0</amountRequested>
    </org.MtgAmountRequestedFacts>
  </insert>
  <fire-all-rules></fire>
</batch-execution>

However, the server responds with an error:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<response type="FAILURE" msg="Error calling container mortgage: java.lang.RuntimeException: Cannot find a default KieSession"></response>