Hi Team,
I am unable to merge contact in UCI application even after unchecking the checkbox.

There is no system job for cascade operations.
Asyn error log file also not generated but w3wp trace file shows me below error
Crm Exception: Message: The entity with a name = 'none' with namemapping = 'Platform' was not found in the MetadataCache. MetadataCacheDetails: ProviderType=Dynamic, StandardCache=True, IsLoadedInStagedContext = False, Timestamp=860651916, MinActiveRowVersion=860651916, MetadataInstanceId=52033315, ErrorCode: -2147217150
[2021-07-12 14:07:33.144] Process: w3wp |Organization:2bf0813f-d499-47e9-8427-520a097d4d66 |Thread: 98 |Category: Application |User: 00000000-0000-0000-0000-000000000000 |Level: Error |ReqId: 7a80a45e-3713-45f1-aaf2-319ab0b641cc |ActivityId: 7a80a45e-3713-45f1-aaf2-319ab0b641cc | RuntimeMethodHandle.InvokeMethod ilOffset = 0xFFFFFFFF
at RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor) ilOffset = 0xFFFFFFFF
at RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments) ilOffset = 0x16
at RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) ilOffset = 0x6C
at LogicalMethodInfo.Invoke(Object target, Object[] values) ilOffset = 0x3F
at WebServiceHandler.Invoke() ilOffset = 0xAE
at WebServiceHandler.CoreProcessRequest() ilOffset = 0x134
at SyncSessionlessHandler.ProcessRequest(HttpContext context) ilOffset = 0x39
at CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() ilOffset = 0x18D
at HttpApplication.ExecuteStepImpl(IExecutionStep step) ilOffset = 0x64
at HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) ilOffset = 0x15
at PipelineStepManager.ResumeSteps(Exception error) ilOffset = 0x27A
at HttpApplication.BeginProcessRequestNotification(HttpContext context, AsyncCallback cb) ilOffset = 0x31
at HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) ilOffset = 0xB0
at PipelineRuntime.ProcessRequestNotificationHelper(IntPtr rootedObjectsPointer, IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags) ilOffset = 0x131
at PipelineRuntime.ProcessRequestNotification(IntPtr rootedObjectsPointer, IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags) ilOffset = 0x0
at UnsafeIISMethods.MgdIndicateCompletion(IntPtr pHandler, RequestNotificationStatus& notificationStatus) ilOffset = 0xFFFFFFFF
at UnsafeIISMethods.MgdIndicateCompletion(IntPtr pHandler, RequestNotificationStatus& notificationStatus) ilOffset = 0xFFFFFFFF
at PipelineRuntime.ProcessRequestNotificationHelper(IntPtr rootedObjectsPointer, IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags) ilOffset = 0x1E7
at PipelineRuntime.ProcessRequestNotification(IntPtr rootedObjectsPointer, IntPtr nativeRequestContext, IntPtr moduleData, Int32 flags) ilOffset = 0x0
>Script error encountered: