I have a big problem. All I got when I try to get to my Sugarcrm-login-Site is this:

Warning: ini_set(): Cannot change zlib.output_compression - headers already sent in /kunden/xxx/webseiten/crm-intern/include/utils.php on line 2906

Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /kunden/xxx/webseiten/crm-intern/config.php:1) in /kunden/xxx/webseiten/crm-intern/index.php on line 178

Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /kunden/xxx/webseiten/crm-intern/config.php:1) in /kunden/xxx/webseiten/crm-intern/index.php on line 178

Warning: Cannot modify header information - headers already sent by (output started at /kunden/xxx/webseiten/crm-intern/config.php:1) in /kunden/xxx/webseiten/crm-intern/index.php on line 216
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All I did was this: I tried to enable the SSL via config.php. But it gave me the error above. Than I changed it back: "ssl=false". Nothing. Still the same Problem. What can I do to fix this?!?

Any help is appreciated. Cheers!

(I use Sugar Open Source 4.5.1b)