Why argo throw exception " Failed: invalid spec: template reference exceeded max depth (10)"

[xiaohan2013]

template reference exceeded max depth

I deployed argo-workflow for v3.2.9 on the k8s cluster for v1.14.1, and also defined a workflowtemplate through yaml file. Everything go well. Once I submit the workflowtemplate, I'll go an exception " Failed: invalid spec: template reference exceeded max depth (10)".

I search the whole source code of argo-workflow，and only one result telled me where the exception occurs.

But, the caller parameter depth is fixed value 0