You have . / configure> error.log The slash is surrounded by spaces. Removes those two spaces. And although not required, for better readability, add a space between the e and the greater than sign.
Speaking of readability, please use code tags the next time you post code.
Well to do what you are asking change install.sh to read:
chmod u+x configure
./configure > error.log
This assumes that you are running either as root on as the owner of the configure file. Are you sure that you are running install.sh as the proper user?