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it always showed the error even after a clean install.

Deprecated: Assigning the return value of new by reference is deprecated in C:xampplitehtdocswordpressforumbb-adminincludesclass.bb-install.php on line 1280

Deprecated: Assigning the return value of new by reference is deprecated in C:xampplitehtdocswordpressforumbb-includesfunctions.bb-l10n.php on line 484

Warning: Cannot modify header information – headers already sent by (output started at C:xampplitehtdocswordpressforumbb-adminincludesclass.bb-install.php:1280) in C:xampplitehtdocswordpressforumbb-adminincludesclass.bb-install.php on line 390

Deprecated: Assigning the return value of new by reference is deprecated in C:xampplitehtdocswordpressforumbb-includesbackpresspomomo.php on line 171

Warning: Cannot modify header information – headers already sent by (output started at C:xampplitehtdocswordpressforumbb-adminincludesclass.bb-install.php:1280) in C:xampplitehtdocswordpressforumbb-includesfunctions.bb-core.php on line 1101