We have build a solution using the Customer Service for Communications 7.31 and suddenly started having an issue where a new Interaction cannot be started and the Interaction UI just shows blank when a user tried to start one by accepting a call or trying to start a customer search.

We have tried loading our application using older ruleset versions that are know to work without this issue but the issue persists so we don't believe this is due to any changes that were made.

Has anyone run into a similar issue?

The error that gets generated is:

2018-08-23 16:37:54,613 GMT*8*EXCP0001*0*0*f25416f45c40e82ffdb903d352594bfb*NA*NA*HXCULRCY63XW12T83V2EF1YHTD4TW564R*XX.XXXX*XXX-AT-CSS-Work-Grp1*AgentDesktop:01.01.01*95e9afc37aae8d837f5e4dfdc8420f62*Y*62*HXCULRCY63XW12T83V2EF1YHTD4TW564R*2364*[ACTIVE] ExecuteThread: '8' for queue: 'weblogic.kernel.Default (self-tuning)'*PS1__TABTHREAD2*Rule_HTML_Fragment.WorkFormStandard.Stream* Proprietary information hidden| Proprietary information hidden*[email protected]*Rule-Obj-Activity:ApplicationSetup*@BASECLASS GETWORKSTYLE #20170206T215207.623 GMT Step: 13 Circum: 0*9****NA*NA*XXX-AT-CSS-Work-Grp2-Interaction-Call*pyWorkPage*XXX-AT-CSS-Work-Grp2-Interaction-Call*pyWorkPage*appendStream Rule-HTML-Fragment:WorkFormStandard;appendStream Rule-HTML-Harness:Perform;getStream Rule-HTML-Harness:PerformFrames;java;RULE-OBJ-ACTIVITY @BASECLASS SHOW-HARNESS #20170704T075034.277 GMT Step: 7 Circum: 0;20 additional frames in stack;*assignPage=newAssignPage;pzHarnessID=HIDD07836B343093DFF867CE1AA25F21E92;OutputPageClass=Code-ProcessOutput;DraftMode=false;pyNextAssignmentWorkBasket=false;AccessGroupName=;InsClass=XXX-AT-CSS-Work-Grp2-Interaction-Call;releaseLockManually=true;tabIndex=3;FieldError=;ReferencePageName=pyWorkPage;pyContentType=Work-;pyActionLabel=Start interaction with customer;ConsiderLockingMode=true;portalName=CPMInteractionPortal;EXPANDEDSectionNewCore=true;StartingHarness=New;FlowHandle=RULE-OBJ-FLOW PEGACA-WORK-INTERACTION-CALL CPMINTERACTION #20180823T133026.905 GMT;FrameName=pyWorkPage;[email protected];coverPage=pyWorkCover;action=createnewwork;elementAction=OPEN;IgnoreDirty=false;FolderType=pyDefault;pyCustomError=;ReadOnly=-1;pyNextAssignment=true;enableTemplate=default;FlowHasEnded=N;pyRecordKey=XXX-AT-CSS-WORK-GRP2-INTERACTION I-5623;TaskIndex=1;flowName=CPMInteraction;MergePage=;workHandle=XXX-AT-CSS-WORK-GRP2-INTERACTION I-5623;EXPANDEDSectionHeader=true;ModelToUse=pyDefault;pzPrimaryHarnessPageClass=XXX-AT-CSS-Work-Grp2-Interaction-Call;EXPANDEDSectionCore=true;bExcludeLegacyJS=true;pyConfirmChoice=AutoClose;SuccessIndicator=0;iconPath=images/pyCaseTreeTask.gif;EXPANDEDSectionNewCoreParty=true;EXPANDEDSectionNewHeader=true;Action=Perform;portalThread=OpenPortal;className=;WorkPartiesRule=pyCaseManagementDefault;AJAXTrackID=1;SkipNewHarness=true;portalThreadName=OpenPortal;CoverClass=;KeepFixedVisible=true;workPage=pyWorkPage;streamKeys={pxObjClassEQUALSRule-HTML-Harness, pyStreamNameEQUALSPerformFrames};pyStatus=success;OnlyCreateOutputPageIfError=true;inStandardsMode=true;HarnessType=Perform;checkWorkbaskets=false;dynamicContainerID=c66230a4-dae4-4346-afb0-c6c544079c8e;key=XXX-AT-CSS-WORK-GRP2-INTERACTION I-5623;AlwaysShowFormLevelErrors=false;FormError=;pyNextAssignmentWorkBasketAdhoc=false;assignmentHandle=ASSIGN-WORKLIST XXX-AT-CSS-WORK-GRP2-INTERACTION I-5623!APPCONTACTSEARCH;contentID=ad4921b1-a7be-6a81-ad0d-b6055bfa2604;pyNextAssignmentAdhoc=true;bPersist=true;Purpose=PerformFrames;pzPrimaryHarnessPageName=pyWorkPage;label=I-5623;TaskStatus=CPMSearch;InHarness=true;CreatesTemporaryObject=false;pyStackTrace=;EXPANDEDSectionAction=true;threadID=PS1__TABTHREAD2;GetWorkCreateInfo=;HasAutoStart=false;CurrentUserHasOwnership=true;pyConfirmHarness=AutoClose;workPageName=pyWorkPage;ClientInt=Start;HarnessPurpose=New;threadFamilyName=;HTMLClass=Rule-HTML-Harness;FlowType=CPMInteraction;StartingModel=pyDefault;pyStreamName=Perform;OutputPageName=pyOutput;HarnessMode=ACTION;streamKeys2={pxObjClassEQUALSRule-HTML-Harness, pzInputEQUALSNoInput, pyStreamNameEQUALSPerformFrames};*[MSG][Section 'pzClientDynamicData' execution error on page 'pyWorkPage' of class XXX-AT-CSS-Work-Grp2-Interaction-Call'.][STACK][com.pega.pegarules.pub.clipboard.InvalidParameterException: Expression must have output. Details: Invalid value for RULE-DECLARE-EXPRESSIONS PEGACA-WORK-INTERACTION .WORKSTATUS!.ACCOUNTS() #20171018T100135.480 GMT passed to ChainingEngine.addChangeTreeRule()<CR> at com.pega.pegarules.exec.internal.declare.infengine.ChainingEngine.addChangeTreeRule(ChainingEngine.java:1509)<CR> at com.pega.pegarules.exec.internal.declare.infengine.ChainingEngine.addChangeTreeVariable(ChainingEngine.java:1405)<CR> at com.pega.pegarules.exec.internal.declare.infengine.ChainingEngine.addChangeTree(ChainingEngine.java:1257)<CR> at com.pega.pegarules.exec.internal.declare.infengine.InfEngUtilsImpl.getExpressionMetadata(InfEngUtilsImpl.java:1042)<CR> at com.pegarules.generated.html_fragment.ra_stream_workformstandard_37d09b5e9bb09bfd2e6aeb1fd20ea661.performStream_4(ra_stream_workformstandard_37d09b5e9bb09bfd2e6aeb1fd20ea661.java:4946)<CR> at com.pegarules.generated.html_fragment.ra_stream_workformstandard_37d09b5e9bb09bfd2e6aeb1fd20ea661.include_4(ra_stream_workformstandard_37d09b5e9bb09bfd2e6aeb1fd20ea661.java:5258)<CR> at com.pegarules.generated.html_fragment.ra_stream_workformstandard_37d09b5e9bb09bfd2e6aeb1fd20ea661.performStream_6(ra_stream_workformstandard_37d09b5e9bb09bfd2e6aeb1fd20ea661.java:5711)<CR> at com.pegarules.generated.html_fragment.ra_stream_workformstandard_37d09b5e9bb09bfd2e6aeb1fd20ea661.include_6(ra_stream_workformstandard_37d09b5e9bb09bfd2e6aeb1fd20ea661.java:5770)<CR> at com.pegarules.generated.html_fragment.ra_stream_workformstandard_37d09b5e9bb09bfd2e6aeb1fd20ea661.performStream_11(ra_stream_workformstandard_37d09b5e9bb09bfd2e6aeb1fd20ea661.java:6154)<CR> at com.pegarules.generated.html_fragment.ra_stream_workformstandard_37d09b5e9bb09bfd2e6aeb1fd20ea661.execute(ra_stream_workformstandard_37d09b5e9bb09bfd2e6aeb1fd20ea661.java:110)<CR> at com.pega.pegarules.session.internal.mgmt.StreamBuilderTools.appendStreamKeepProperties(StreamBuilderTools.java:779)<CR> at com.pega.pegarules.session.internal.mgmt.autostreams.IncludeStreamRuntime.getStream(IncludeStreamRuntime.java:332)<CR> at com.pega.pegarules.session.internal.mgmt.autostreams.IncludeStreamRuntime.emitIncludeStreamReference(IncludeStreamRuntime.java:252)<CR> at com.pega.pegarules.session.internal.mgmt.autostreams.AutoStreamRuntimeImpl.emitIncludeStreamReference(AutoStreamRuntimeImpl.java:409)<CR> at com.pegarules.generated.html_harness.ra_stream_perform_3682e8f79f68cdccbc676f030e9a0719.buildHarnessMarkup_1(ra_stream_perform_3682e8f79f68cdccbc676f030e9a0719.java:3763)<CR> at com.pegarules.generated.html_harness.ra_stream_perform_3682e8f79f68cdccbc676f030e9a0719.performStream_16(ra_stream_perform_3682e8f79f68cdccbc676f030e9a0719.java:3907)<CR> at com.pegarules.generated.html_harness.ra_stream_perform_3682e8f79f68cdccbc676f030e9a0719.execute(ra_stream_perform_3682e8f79f68cdccbc676f030e9a0719.java:124)<CR> at com.pega.pegarules.session.internal.mgmt.StreamBuilderTools.appendStreamKeepProperties(StreamBuilderTools.java:779)<CR> at com.pega.pegarules.session.internal.mgmt.autostreams.IncludeStreamRuntime.getStream(IncludeStreamRuntime.java:332)<CR> at com.pega.pegarules.session.internal.mgmt.autostreams.IncludeStreamRuntime.emitIncludeStreamReference(IncludeStreamRuntime.java:252)<CR> at com.pega.pegarules.session.internal.mgmt.autostreams.AutoStreamRuntimeImpl.emitIncludeStreamReference(AutoStreamRuntimeImpl.java:409)<CR> at com.pegarules.generated.html_harness.ra_stream_performframes_f140699da265e346490b854df3c1ae4a.choose_9(ra_stream_performframes_f140699da265e346490b854df3c1ae4a.java:5341)<CR> at com.pegarules.generated.html_harness.ra_stream_performframes_f140699da265e346490b854df3c1ae4a.includeFrameStream_2(ra_stream_performframes_f140699da265e346490b854df3c1ae4a.java:5430)<CR> at com.pegarules.generated.html_harness.ra_stream_performframes_f140699da265e346490b854df3c1ae4a.buildHarnessMarkup_2(ra_stream_performframes_f140699da265e346490b854df3c1ae4a.java:5536)<CR> at com.pegarules.generated.html_harness.ra_stream_performframes_f140699da265e346490b854df3c1ae4a.performStream_23(ra_stream_performframes_f140699da265e346490b854df3c1ae4a.java:5712)<CR> at com.pegarules.generated.html_harness.ra_stream_performframes_f140699da265e346490b854df3c1ae4a.execute(ra_stream_performframes_f140699da265e346490b854df3c1ae4a.java:124)<CR> at com.pega.pegarules.session.internal.mgmt.Executable.getStream(Executable.java:4136)<CR> at com.pega.pegarules.session.internal.mgmt.Executable.getStream(Executable.java:3958)<CR> at com.pegarules.generated.activity.ra_action_show_harness_38c1e950e2ed0560df24e75dcd8a7552.step7_circum0(ra_action_show_harness_38c1e950e2ed0560df24e75dcd8a7552.java:746)<CR> at com.pegarules.generated.activity.ra_action_show_harness_38c1e950e2ed0560df24e75dcd8a7552.perform(ra_action_show_harness_38c1e950e2ed0560df24e75dcd8a7552.java:173)<CR> at com.pega.pegarules.session.internal.mgmt.Executable.doActivity(Executable.java:3597)<CR> at com.pega.pegarules.session.internal.mgmt.Executable.invokeActivity(Executable.java:10845)<CR> at com.pegarules.generated.activity.ra_action_displayharness_3e3db5794319c3917bbb07b4f72d85ad.step3_circum0(ra_action_displayharness_3e3db5794319c3917bbb07b4f72d85ad.java:411)<CR> at com.pegarules.generated.activity.ra_action_displayharness_3e3db5794319c3917bbb07b4f72d85ad.perform(ra_action_displayharness_3e3db5794319c3917bbb07b4f72d85ad.java:104)<CR> at com.pega.pegarules.session.internal.mgmt.Executable.doActivity(Executable.java:3597)<CR> at com.pega.pegarules.session.internal.mgmt.Executable.invokeActivity(Executable.java:10845)<CR> at com.pegarules.generated.activity.ra_action_perform_d9c1d32a5bf33446881c42ad6d67a71c.step18_circum0(ra_action_perform_d9c1d32a5bf33446881c42ad6d67a71c.java:1362)<CR> at com.pegarules.generated.activity.ra_action_perform_d9c1d32a5bf33446881c42ad6d67a71c.perform(ra_action_perform_d9c1d32a5bf33446881c42ad6d67a71c.java:387)<CR> at com.pega.pegarules.session.internal.mgmt.Executable.doActivity(Executable.java:3597)<CR> at com.pega.pegarules.session.internal.mgmt.Executable.invokeActivity(Executable.java:10845)<CR> at com.pegarules.generated.activity.ra_action_add_1e48aab691d8ce0dec44b49bb5d96fba.step14_circum0(ra_action_add_1e48aab691d8ce0dec44b49bb5d96fba.java:1373)<CR> at com.pegarules.generated.activity

***Moderator Edit-Vidyaranjan: Updated SR details***