Error With Command, ftp_chdir on Linux/U

[sachinp78]

Hi All,
I have a problem regading the Ftp Command, ftp_chdir.The ftp_chdir($conn_id,$ch_dir) works fine with Win Nt/2k server But Gives Error (Invalid Command cwd )on Linux/Unix server while changing directorys.

Error:

Warning: ftp_chdir: 'CWD ' is an unknown command. in G:\html\ftp_con1.php on line 139

    Thanks in advance.