It won't work after converted from 97 to 2003

[Scott]

I have a simple databased developed on Access 97. Recently I converted it
to 2003 but not work on a parameter query. The program starts with a
opening form. When I press "Esc" key, it will open a form that connects to
a parameter query. The parameter query box appeared. Once I entered the
key words, it failed and display the following error.

Run-time error '2501':
The OpenForm action was canceled.

When click Debug button, it showed

Private Sub Form_KeyPress(KeyAscii As Integer)

If KeyAscii = 27 Then

DoCmd.Close acForm, "frmContributor", acSaveYes
DoCmd.OpenForm "frmTechInfo"
Else
Beep
End If

End Sub

The fourth line was highlighted in yellow. Can someone advise the possible
causes and fixes.

Thanks,

Scott