i'm reading from presentatiion server.
i have a sample notepad file with contains perners like
now i need to read this notepad file to internal table
after reading to internal table simply i need to add one more perner through program.
for this i'm taking an internal table
Data: begin of it_p0001 occurs 0,
end of it_p0001.
CALL FUNCTION 'GUI_UPLOAD'
FILENAME = 'C:\TEST.TXT'
FILETYPE = 'ASC'
DATA_TAB = it_p0001.
but this function module giving an exception "File_open_error".
how to trouble shoot that.