El error es el siguiente:
Called from: => TWBROWSE:ERROR(175)
Called from: tobject.prg => (b)HBOBJECT:HBOBJECT(105)
Called from: => TWBROWSE:MSGNOTFOUND(0)
Called from: WBROWSE.PRG => TWBROWSE:_LVSCROLL(167)
Called from: brw.prg => MAIN(32)