ORA-01002: fetch out of sequence

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Oracle

cursor

I created a procedure in oracle database that returns data in a ref-cursor, and I want it to return the rowcount of this cursor also as an output variable. After testing, the P_count variable is filled correctly, but when I tried to open it an

ORA-01002: fetch out of sequence

error is fired. I have read before about it and I found that the problem is because I am using a fetch statement in. But till now I did not discover how to resolve it. Any helps are appreciated, thank you.
Below is my Procedure:

PROCEDURE IS_CLIENT_LOGGED_IN (P_CLIENT_NUM Varchar2,P_CURSOR out SYS_REFCURSOR ,P_COUNT OUT NUMBER,P_ERROR out Varchar2) AS
 
 cur_rec Varchar2(1024);
   
 BEGIN
 
   BEGIN 
     Open P_CURSOR FOR
     SELECT  ID
     FROM    tbl_registration
     WHERE   tbl_client_id = P_CLIENT_NUM  
     AND     tbl_logout_date is null;
   
   LOOP
    FETCH P_CURSOR INTO cur_rec;  
    EXIT WHEN P_CURSOR%notfound;
    P_COUNT := P_CURSOR%rowcount;--will return row number beginning with 1
   END LOOP;
     
  
   EXCEPTION WHEN OTHERS THEN 
       P_ERROR := 'Unable to select Data from tbl_registration' ||SQLERRM;
   END; 
      
 END IS_CLIENT_LOGGED_IN;

What I have tried:

I removed section LOOP ... END LOOP cursor has opened normally, any hints?