Csharp: FreeTextbox 编辑器控件运行时错误: 'FTB_ResizeGalleryArea' 未定义

<form id="Form1" runat="server" enctype="multipart/form-data">
<FTB:ImageGallery id="ImageGallery1"
JavaScriptLocation="InternalResource"
UtilityImagesLocation="InternalResource"
SupportFolder="~/aspnet_client/FreeTextBox/"
AllowImageDelete="true" AllowImageUpload="true" AllowDirectoryCreate="true" AllowDirectoryDelete="true" runat="Server" />

</form>

<FTB:FreeTextBox ID="FreeTextBox1" runat="server"  SupportFolder="~/aspnet_client/FreeTextBox/"   ImageGalleryPath="~/saveimages/" language="zh-CN"  toolbarlayout="ParagraphMenu,FontFacesMenu,FontSizesMenu,FontForeColorsMenu,FontForeColorPicker,FontBackColorsMenu,FontBackColorPicker|Bold,Italic,Underline,Strikethrough,Superscript,Subscript,RemoveFormat|JustifyLeft,JustifyRight,JustifyCenter,JustifyFull;BulletedList,NumberedList,Indent,Outdent;CreateLink,Unlink,InsertImage,InsertImageFromGallery|Cut,Copy,Paste,Delete;Undo,Redo,Print,Save|SymbolsMenu,StylesMenu,InsertHtmlMenu|InsertRule,InsertDate,InsertTime|InsertTable,EditTable;InsertTableRowAfter,InsertTableRowBefore,DeleteTableRow;InsertTableColumnAfter,InsertTableColumnBefore,DeleteTableColumn|InsertForm,InsertTextBox,InsertTextArea,InsertRadioButton,InsertCheckBox,InsertDropDownList,InsertButton|InsertDiv,EditStyle,InsertImageFromGallery,Preview,SelectAll,WordClean,NetSpell"
Width="500px" Height="260px">
</FTB:FreeTextBox>