How to solve ‘Dynamic method call failed’ error in SAP ABAP

Main issue : The formal parameter RR_INTERFACE_OBJECT does not exist.

Exception Error : DYN_CALL_METH_PARAM_NOT FOUND

METHOD test.
DATA ls_ptab TYPE abap_parmbind.
DATA lt_ptab TYPE abap_parmbind_tab.
DATA lr_ztc_check cls TYPE REF TO object.
DATA rr_class_object TYPE REF TO object.
DATA lr zif_dynamic_interface TYPE REF TO data.
DATA lv_instance_variable TYPE i.
CREATE DATA lr_zif_dynamic interface TYPE REF TO (‘ZIF_DYNAMIC_INTERFACE’).
ls_ptab-name ( ‘RR INTERFACE OBJECT’ ).
ls_ptab-kind = cl_abap_objectdescr=>returning.
ls_ptab-value = lr_zif_dynamic_interface.
INSERT Is_ptab INTO TABLE lt_ptab.
CALL METHOD (‘ZTC_CHECK_CLS’)=>(‘GET_INTERFACE_OBJECT’)
PARAMETER-TABLE lt_ptab.
CLEAR 1s_ptab.
CLEAR It_plab.
ls_ptab-name = ( ‘rv_instance_variable’ ).
ls_ptab-kind = cl_abap_objectdescr=>returning.
ls_ptab-value = REF #( lv instance_variable ).
INSERT ls_ptab INTO TABLE lt_ptab.
“getting the class instance object through interface method
CREATE OBJECT lr_ztc_check_cls TYPE (‘ZTC_CHECK_CLS’).
1r_ztc_check_cls = CAST #( lr_zif_dynamic interface ).
CALL METHOD lr_ztc_check_cls->(‘GET_INSTANCE_VARIABLE’)
PARAMETER-TABLE It_pt4b.
cl_abap_unit_assert->assert_equals( act = lv_instance_variable
exp = 10 ).
ENDMETHOD

Reason: parameter table lt_ptab is not maintained properly for the second dynamic method call

ls_ptab-name = ( ‘RV_INSTANCE_VARIABLE. ).
ls_ptab-kind = cl_abap_objectdescr=>returning.
ls_ptab-value = REF #( lv_instance_variable ).
INSERT ls_ptab INTO TABLE lt_ptab.
EXPLANAlION : returning variable name of the method must be written in capital letters