[oracle] Oracle Error ORA-06512

Just can't figure out why it gives me ORA-06512 Error

PROCEDURE PX(pNum INT,pIdM INT,pCv VARCHAR2,pSup FLOAT)
AS
    vSOME_EX EXCEPTION;

BEGIN 
    IF ((pNum < 12) OR (pNum > 14)) THEN     
        RAISE vSOME_EX;
    ELSE  
        EXECUTE IMMEDIATE  'INSERT INTO M'||pNum||'GR (CV, SUP, IDM'||pNum||') VALUES('||pCv||', '||pSup||', '||pIdM||')';
    END IF;
END PX;

The structure base for the table where the insert is made:

CREATE TABLE "DB"."M12GR" (
    "IDM12GR" NUMBER(10,0) NOT NULL ENABLE, 
    "CV" VARCHAR(5) NOT NULL ENABLE, 
    "SUP" FLOAT(126) NOT NULL ENABLE, 
    "IDM12" NUMBER(10,0) NOT NULL ENABLE, 

    CONSTRAINT "PRIMARY_30" PRIMARY KEY ("IDM12GR"),
    CONSTRAINT "M12SUELORM12" FOREIGN KEY ("IDM12") REFERENCES "DB"."M12" ("IDM12") ENABLE
)

The variable pCv is of type VARCHAR2 so when you concat the insert you aren't putting it inside single quotes:

 EXECUTE IMMEDIATE  'INSERT INTO M'||pNum||'GR (CV, SUP, IDM'||pNum||') VALUES('''||pCv||''', '||pSup||', '||pIdM||')';

Additionally the error ORA-06512 raise when you are trying to insert a value too large in a column. Check the definiton of the table M_pNum_GR and the parameters that you are sending. Just for clarify if you try to insert the value 100 on a NUMERIC(2) field the error will raise.

I also had the same error. In my case reason was I have created a update trigger on a table and under that trigger I am again updating the same table. And when I have removed the update statement from the trigger my problem has been resolved.