Vector<vector> do not have a compiled collection proxy

Dear rooters,
When I run a macro file, I encounter following errors:
Error in TChain::SetBranchAddress: The class requested (vector<vector<float,allocator > >) for the branch “tau1p3p_Pi0eta” refer to an stl collection and do not have a compiled CollectionProxy. Please generate the dictionary for this class (vector<vector<float,allocator > >)
The variable tau1p3p_Pi0eta is declared as
vector<vector > *tau1p3p_Pi0eta;

My macro is as following
gROOT->ProcessLine("#include ");
TChain ch(“CollectionTree”);


there have been several posts on this topic already; you could have seen them by simply searching for e.g. “compiled collectionproxy”. This one should get you going: