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Error The type 'ESRI.ArcGIS.Geometry.SpatialReferenceEnvironmentClass' has no constru

Question asked by shaningesri on Mar 12, 2012
Latest reply on Jan 23, 2015 by Barbara_Schneider
I updated a .Net project from FW 3.5 to 4.0 (change the .Net FW target), I received a dozen of errors about No Constructors defined.  One of them is below:
Error  The type 'ESRI.ArcGIS.Geometry.SpatialReferenceEnvironmentClass' has no constructors defined
What should I do to solve this problem?  Thanks.