Registeration error

Had a really interesting error that I do not know how to resolve. After I registered as a new user and clicking the submit button, I get the chunk of error below:

Notice: A non well formed numeric value encountered in public_html/mystore/system/library/mail.php on line 153Notice: A non well formed numeric value encountered in public_html/mystore/system/library/mail.php on line 153Warning: Cannot modify header information - headers already sent by (output started at public_html/mystore/index.php:104) in public_html/mystore/vqmod/vqcache/vq2-system_engine_controller.php on line 28Warning: Cannot modify header information - headers already sent by (output started at public_html/mystore/index.php:104) in public_html/mystore/vqmod/vqcache/vq2-system_engine_controller.php on line 29

The interesting thing is, after this error comes out and I refresh the page, I am back to my site and AS A REGISTERED USER???? (ie. already logged in).

Is this something to do with my vqmod? Anyone knows what is wrong?

Anyone? I am really desperate. My site cannot be published if this error exist. Have tried to overwrite the files that I have recently amended but this error is still here. I have also updated the latest version of vqmod but still have the same problem.

Resolved...

hi,
Can you show me how to resolved it. I have the same problem.
Thanks