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Stackoverflow occurred when retrieving descendant messages. There are more than &(1:) levels in the message hierarchy or there is a circular reference.
&(1:) - The number of levels (parent / child) relations the API can handle
When retrieving the child / grandchild / ... messages for a parent message it is necessary to keep a stack that contains the "path" of the current descendant message being handled. The message indicates that the maximum number of levels in this stack has been exceeded.
Theoretically it is possible that you have built an extremely deep message structure - but it is far more likely that you have created a circular reference - so that a child message refers to it's parent as a child (or to any other message that has the child as a descendant).
You should check whether this is the case. If it is, you should investigate the programs calling the API Message.AddReferenceToMainMessage - most likely one of these assignments has switched the parent and child message IDs.
System / Error
Online
documentation - WebsydianExpress v3.5