Error in TTree::SetBranchStatus

ROOT
1

when I ran my code, it post an error “Error in TTree::SetBranchStatus：unknown branch → t1”.

And the code is

    if(t==NULL)	return;
    t->SetBranchStatus("*",1);

This is the only place I use “SetBranchStatus”

I wonder what this error indicates.

2

What do you get from: t->Print();

3

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