That error means that there is some sort of output to the page before the header() function used to redirect the page is called.
the error is occurring at line 91, but it is reporting the output that causes the error at line 1 in this section of the error:
output started at /home/house345/public_html/hf1/members/account/index.php:1
Where it is pointing to line 1, that usually happens if the Unicode Signature (BOM) is enabled on the page, it is a PHP bug.
See the following page for details on the error and how to correct it:
Near the end, I talk about the BOM bug.