PLSQL BLOCK TO RUN A TYPE PROCEDURE

I have created a type called bank_account which has many member functions and procedures to open ,close,deposit and withdraw.I have created a type body where these member functions are defined.i have created a table based on this type.
Now my problem is that the plsql block that i have written to call the member function open gives the following error:
method dispatch on NULL SELF argument is disallowed
the plsql block is as given below:
SQL> run
1 declare
2 amount real;
3 a bank_account(this is the type);
4 begin
5 amount:=&amount;
6 a.open(amount);
7 dbms_output.put_line('account opened');
8* end;
Enter value for amount: 5
old 5: amount:=&amount;
new 5: amount:=5;
declare
ERROR at line 1:
ORA-30625: method dispatch on NULL SELF argument is disallowed
ORA-06512: at line 6
please help me to solve my problem
null

I have created a type called bank_account which has many member functions and procedures to open ,close,deposit and withdraw.I have created a type body where these member functions are defined.i have created a table based on this type.
Now my problem is that the plsql block that i have written to call the member function open gives the following error:
method dispatch on NULL SELF argument is disallowed
the plsql block is as given below:
SQL> run
1 declare
2 amount real;
3 a bank_account(this is the type);
4 begin
5 amount:=&amount;
6 a.open(amount);
7 dbms_output.put_line('account opened');
8* end;
Enter value for amount: 5
old 5: amount:=&amount;
new 5: amount:=5;
declare
ERROR at line 1:
ORA-30625: method dispatch on NULL SELF argument is disallowed
ORA-06512: at line 6
please help me to solve my problem
null

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    2. Design the report as below, then deploy the report to the SharePoint site.
    3. Create the script.js file with code below, and upload to the SharePoint site.
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    4. Run the report. Click the “inject”->”test”, the final results should look like below:
    If you have any question, please feel free to ask.
    Best regards,
    Qiuyun Yu
    Qiuyun Yu
    TechNet Community Support

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