Calltransformation of ABAP to XMl

HI all,

i got an error when i run the program which has the following syntax

call transformation z_id

source output = git_nisl_file

result xml xml_out.

append xml_out to xmltable.

loop at xmltable into wa_xmltable.

transfer wa_xmltable-record to gv_file.

endloop.

here i am trying to transform the internal table data to XML format where it is giving error like "XML page can not be dispalyed".

"Cannot view XML input using XSL style sheet , please correct the error and then click the refresh button,or try again later."

can you give the solution for this error?