How to delete the garbage file in my directory

Dear Sirs,

In the followimg directory of mine, there is a file named 
download2_RXTE_data.txt,
which 
has been produced for unclear reasons.

address@hidden dinggq]$ ls
article/     cxcds_param/               hexte/                    oridata/  
SS433/  udata/
CARPS/    download2_RXTE_data.txt     hexte_calib_data  pca/      temp/     zz/
CirX-1/    download_RXTE_data.txt      ihep/                     pfiles/    
temp1/
address@hidden dinggq]$ rm download2_RXTE_data.txt
rm: cannot lstat `download2_RXTE_data.txt': No such file or directory
address@hidden dinggq]$

Would you please tell me how to delete the garbage file 
(download2_RXTE_data.txt)
in the directory ?

Best regards,

Guoqiang Ding