水晶报表版本冲突 及 解决办法

 The type 'CrystalDecisions.Web.CrystalReportViewer' exists in both 'c:\Windows\assembly\GAC_MSIL\CrystalDecisions.Web.5.3700.0__692fbea5521e1304\CrystalDecisions.Web.dll' and 'c:\Windows\assembly\GAC_MSIL\CrystalDecisions.Web.0.2000.0__692fbea5521e1304\CrystalDecisions.Web.dll' The type 'CrystalDecisions.Web.CrystalReportVi