Why getting syntax error from ldifde.ex while importing .ldf file for extending schema

I don't know why I am getting following error again and again :

> There is a syntax error in the input file Failed on line 1.  The last> token starts with '1'. 0 entries modified successfully.

Or following error :

> Add error on entry starting on line 18: No Such Attribute> > The server side error is: 0x57 The parameter is incorrect.> > The extended server error is:> > 00000057: LdapErr: DSID-0C090FB4, comment: Error in attribute> conversion operation, data 0, v3839> > 0 entries modified successfully.

Or following is also appearing ..

Add error on entry starting on line 18: No Such Attribute
The server side error is: 0x57 The parameter is incorrect.
The extended server error is:
00000057: LdapErr: DSID-0C090FB4, comment: Error in attribute conversion operation, data 0, v3839
0 entries modified successfully.
An error has occurred in the program
No log files were written.  In order to generate a log file, please
specify the log file path via the -j option.

I have executed sample file over again and again which was perfectly imported in last days. I have made no changes but still I am getting this error.

I am using following way :

Can any body help to solve this?

Thanks