VFP使用WebBrowser控件会报错【OLE 错误码 Ox80004005:Unspeci fied error】

VFP使用WebBrowser控件会报错，如：
of = CREATEOBJECT("form1")
of.show(1)

DEFINE CLASS form1 As Form
    Width = 800
    Height = 600
    ADD OBJECT URL as TextBox WITH Top=10,Left=10,Width=680,Height=22,Anchor=11,;
        Value = "http://www.baidu.com"
    ADD OBJECT CMD1 as CommandButton WITH Top=10,Left=700,Width=40,Height=22,Anchor=9,Caption = ">>>"
    Add Object WB As Olecontrol WITH OleClass="Shell.Explorer.2",Top=40,Left=0,Width=800,Height=460,Anchor=15,Visible=.T.
        
    PROCEDURE Init
        this.WB.Silent = .T.
    ENDPROC

    PROCEDURE CMD1.Click
        thisform.WB.navigate(ALLTRIM(thisform.URL.Value), 0, NuLL, NULL, NULL)
        thisform.WB.SetFocus
    ENDPROC
ENDDEFINE

运行以上程序会报错【OLE 错误码 Ox80004005:Unspeci fied error】，请问要如何解决？