Fix

YingboMa · YingboMa · commit daddaab61f32 · 2021-07-15T11:32:51.000-04:00
diff --git a/src/ModelingToolkit.jl b/src/ModelingToolkit.jl
@@ -54,6 +54,7 @@ import Symbolics: rename, get_variables!, _solve, hessian_sparsity,
 
 import DiffEqBase: @add_kwonly
 
+using LightGraphs
 import LightGraphs: SimpleDiGraph, add_edge!
 
 using Requires
