Error Message - Parser Error Message: The 'DisplayGroupTree' property cannot be set declaratively.

After upgrading Crystal Report to version 13 you may get error message
Parser Error Message: The 'DisplayGroupTree' property cannot be set declaratively.
while running your website.
To fix it replace
DisplayGroupTree="False"
with
ToolPanelView="None"
so your html code looks like

<cr:crystalreportviewer id="CrystalReportViewer1"  ToolPanelView="None"></cr:crystalreportviewer>