PLS-00049: bad bind variable when calling stored procedure

I am trying to call a stored procedure from within an existing Oracle stored procedure.  The stored procedure I am attempting to call returns a ref cursor.  The issue I encountered is I can't seem to define the ref cursor variable I need to pass to the stored procedure correctly.  I keep getting the error:  "PLS-0049:  bad bind variable".  See below code example.

Any help you could provide would be greatly appreciated.

Procedure Some_Procedure IS
x ref_cursor;
 
Begin
 
  Other_Proc('1','2','3','4',:x);
 
End Some_Procedure;
 
-- Other Procs in/out variables
Procedure Other_Proc
(
var1  varchar2,
var2  varchar2,
var3  varchar2,
var4  varchar2,
P_CURSOR  IN OUT   RET_REFCURSOR);

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