ORA-22288: file or LOB operation FILEOPEN faile

I tried to execute the following sql script in Oracle satabase environment which hosted in Unix server, i hit the problem at below error message. Please advice what to do resolve it. I am not a unix person. Thank you.

Sql Script :
----
create or replace
 java class
 using bfile (runtime_classes,'DatabaseStoredFunctions.class');
/
commit;

create or replace
 function generate_key( nSize IN number )
 return varchar2
 as language java
 name 'com.lgc.dws.dt.util.DatabaseStoredFunctions.generateKeyBySize( int ) return java.lang.String';
/
commit;

create or replace
 function get_color_number( colorName IN varchar2 )
 return number
 as language java
 name 'com.lgc.dws.dt.util.DatabaseStoredFunctions.getColorNumber( java.lang.String ) return int';
/
commit;

create or replace
 function radians( degrees IN number )
 return number
 as language java
 name 'com.lgc.dws.dt.util.DatabaseStoredFunctions.getRadians( double ) return double';
/
commit;


create or replace
 function get_yes_no( yesno IN number )
 return varchar2
 as language java
 name 'com.lgc.dws.dt.util.DatabaseStoredFunctions.getYesNo( java.lang.Integer ) return java.lang.String';
/
commit;


create or replace
 function get_is_tight( istight IN number )
 return varchar2
 as language java
 name 'com.lgc.dws.dt.util.DatabaseStoredFunctions.getIsTight( int ) return java.lang.String';
/
commit;


create or replace
 function get_well_coord_type( coordType IN number )
 return number
 as language java
 name 'com.lgc.dws.dt.util.DatabaseStoredFunctions.getWellCoordType( int ) return int';
/
commit;
---------

Error message:
==========
ERROR at line 3:
ORA-22288: file or LOB operation FILEOPEN failed
No such file or directory