monocle，newcelldataset函数报错救助！

 

mycds <- newCellDataSet(expr_matrix,
+                         phenoData = pd,
+                         featureData = fd,
+                         expressionFamily = negbinomial.size())
错误于warn_version(graph): 
  This graph was created by a now unsupported old igraph version.
  Call upgrade_graph() before using igraph functions on that object.
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igraph版本是2.0.3，依然解决不了问题，怎么办，救救孩子吧