Unable to Open /suite/design Interface

Hello
In Appian 7.9 we are unable to open /suite/design interface due to some expression errors and seeing error as below . We have also checked that all appian engines are Okay. please suggest
Caused by: com.appiancorp.core.expr.fn.object.AppianObjectRuntimeException: com.appiancorp.suiteapi.common.exceptions.AppianException: Appian object error. Details: Failed to execute query in thread for: EngineBackedQueryExecutor [queryKey=CONTENT, typeIds=[37, 12, 63, 19, 62, 61, 60, 85, 36, 39, 40, 83, 84, 86, 82, 38, 13, 20], refClasses=[class com.appiancorp.object.ref.ContentRef, class com.appiancorp.type.refs.ApplicationRefImpl], reducedExecutor=[ReducedExecutor extended-content-service:Content,Folder,Content Community,Knowledge Center,Content Knowledge Center,Content Folder,Content Document,Rule Folder,Content Rule,Content Rule (Freeform),Content Constant,Query Rule,Decision Table,Application,Data Store,Content Custom,Document,Community]]...

OriginalPostID-147883

OriginalPostID-147883

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