2519001 - SLD start issue: java.net.MalformedURLException:The protocol is not allowed

SAP Application Server JAVA Web Dynpro: Start Assigned SLD fails with:

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SLD URL:   null://null:-1/sld   - seems to be not configured correctly.
com.sap.tc.webdynpro.services.exceptions.WDRuntimeException: Invalid URL=null://null:-1/sld.
See nested exception for details. Please check whether the URL contains query parameters which are not allowed for security reasons. See SAP note 864842 for more details.
at com.sap.tc.webdynpro.serverimpl.core.url.AbstractURLGenerator.checkURL(AbstractURLGenerator.java:807)
Caused by: java.net.MalformedURLException: The protocol is not allowed
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Screenshot of the error:

• SAP NETWEAVER
• RELEASE INDEPENDENT

com.sap.tc.webdynpro.services.exceptions.WDRuntimeException, FPMConfigurationUsage, ESS not working, SRM issue, JCO destinations, SSO issue, ticket failed, communication issue, MSS error, rfcexception, RFC_ERROR_COMMUNICATION, CONNECT TO MESSAGE SERVER FAILED,,SAP Production ABAP R/3 ERP SRM CRM ERP PPM SEM APO XI PI PORTAL Test development QA, Propertysheet  UMEBackendConnection Connection and Transport Start Assigned SLD null://null:-1/sld Invalid URL=null://null:-1/sld 864842 java.net.MalformedURLException: The protocol is not allowed SLD_Client SLD_DataSupplier , KBA , BC-WD-JAV , WebDynpro Java , BC-JAS-COR , Enterprise Runtime, Core J2EE Framework , BC-CCM-SLD , System Landscape Directory / Component Repository , BC-MID-CON-JCO , Java-Connector , Problem