RFC model creation in webdynpro giving errors

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I have created a rfc model and after successfully connecting to sap server , it is giving following errors at the last

fo]: Creating Model: LoanBalanceModel

[Info]: Creating Model Class: Bapi_Ap_Acc_Getkeydatebalance_Input

[Info]: Creating Model Class: Bapi_Ap_Acc_Getkeydatebalance_Output

[Fatal]: com.sap.mw.jco.JCO$AbapException: PERMISSION_ERROR

[Info]: Creating Model Class Property: Balancespgli

[Info]: Creating Model Class Property: Companycode

[Info]: Creating Model Class Property: Keydate

[Info]: Creating Model Class Property: Noteditems

[Info]: Creating Model Class Property: Vendor

[Fatal]: com.sap.mw.jco.JCO$AbapException: PERMISSION_ERROR

[Info]: Creating Model Relation: Bapi_Ap_Acc_Getkeydatebalance_Input:Output:Bapi_Ap_Acc_Getkeydatebalance_Output

[Info]: Creating Model Class: Bapi_Ap_Acc_Getopenitems_Input

[Info]: Creating Model Class: Bapi_Ap_Acc_Getopenitems_Output

[Fatal]: java.lang.NullPointerException: null

[Info]: Creating Model Class Property: Companycode

[Info]: Creating Model Class Property: Keydate

[Info]: Creating Model Class Property: Noteditems

[Info]: Creating Model Class Property: Vendor

[Fatal]: com.sap.mw.jco.JCO$AbapException: PERMISSION_ERROR

[Info]: Creating Model Relation: Bapi_Ap_Acc_Getopenitems_Input:Output:Bapi_Ap_Acc_Getopenitems_Output

can anyone help