Can't read activation response file states that for some reason it is Unable to open the activation response file.
This is one of the error messages output to screen by responsegen.
The command-line syntax for responsegen is: responsegen -i infile -o outfile -k keyfile [-a activation_response_file] [-r return_response_file] [-p repair_response_file] [-c config_response_file] [-x][-f failure_response_file] [-t shortcode_response_file] [-s asrfile] [-z] [-h]
One reason for this error could be that there is an additional space between the options and the xml path being specified ,In the above scenario there is an unwanted space between -a and xml\Version2\W1_CreateConfigResponseServerParameter.xml .
On Removing the unwanted space from the command the error gets resolved.