I want to calculate page rank centrality for several networks but in some of 
them I got this error message :
what does it mean and how I can solve it?

Error in page.rank(hep) : 
  At arpack.c:1126 : ARPACK error, The Schur form computed by LAPACK routine 
dlahqr could not be reordered by LAPACK routine dtrsen.

I appreciate if you can help me how to solve this problem
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