Try this:

_SCREEN.FORMS[1].RELEASE

To be sure you're closing the correct form, you might want to expand the code:

FOR EACH Form IN _SCREEN.FORMS
  IF Form.NAME = <Name of form you want to close>
    Form.RELEASE
    EXIT
  ENDIF
ENDFOR

>Hi, I have 2 forms in same time (form1 and form2). In form2 i click in botton to release the form1 example (form1.release) and the message error appears:
>
>"Object FORM1 is not found"
>
>Please help me
>
>thank you all