Paypal express fatal error


It was working all fine until now. I click orange paypal express checkout button and it is not redirecting me to paypal.

I get this

Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 16 bytes) in /home/…/domains/ on line 133

I have the same error and so far do not know how to correct it. Also, I previously was able to accept paypal payments through paypal account and now it just stopped working. So far paypal has not responded with any solution or suggestions. Has anyone else had these problems and know how to fix them? or at least what may cause them?

I do not get error message anymore, but it is not working. Customers login to paypal, return to my site blank white page.