Open cart 1.4.9.5 problem with switching languages..

Open cart 1.4.9.5 problem with switching languages and changing currency...Before server php upgrade all worked good but now when i change multiple times language i get error
Warning: Cannot modify header information - headers already sent by (output started at /home/***/public_html/catalog/language/serbian/serbian.php:1) in /home/***/public_html/system/engine/controller.php on line 27

so i try to disable serbian language and serbian currency but still the same when i choose on front end dropdown option to change currency...anyone having same problem?

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