Showing white blank page when mapping my domain

I have completed installation perfectly according to the documentation of this plugin.

My main site is accordingtotommy.com .I have added a site in subdomain named atripthoughtime.accordingtotommy.com .Without mapping plugin atripthoughtime.accordingtotommy.com is going well. But when i activate mapping plugin and mapped this subdomain in my new domain atripthroughtime.com then it shows blank white page.

Main site (accordingtotommy.com) and added site (atripthoughtime.accordingtotommy.com) is located in the same directory.Also in the new domain located the same directory.Is this ok for multisite?

I have added cname and ip address also when i was trying to mapp this.
atripthoughtime.accordingtotommy.com it is redirect to atripthroughtime.com but showing blank white page.Please give me the right solution.

Very Urgent.Waiting for your response soon.

https://www.ads-software.com/plugins/wordpress-mu-domain-mapping/