Problems with E-mail user function

[PeetaGTS]

It doesn't state that its an error but for some reason it outputs a chunk of the coding. This is what i got:

Emailing users. Page 1/1 (341 users total).

m-dd hh:mm:ss, leave blank for today)","lastpostbefore"); makeinputcode("and Number of Posts is greater than","postslower"); makeinputcode("and Number of Posts is less than","postsupper"); doformfooter("Send Email");