FILE * causing segmentation fault

hi users,

please help me with this problem. i am trying to implement a new agent. i have a method that is periodically invoked to write some statistics in a file. whenever i try to print something in the text file using fprintf i get a segmentation fault. anything without the file pointer seems to work. i have the following lines in my c++ code….

void myAgent:: print_info()
{
FILE * fp;
fp = fopen(“/Documents/ns-allinone-2.31/text.txt”, “a”);
fprintf(fp, “something”) ; //////////causes segmentation fault

}

thanks

meeta