Error message

• Warning: mkdir(): Permission denied in boost_mkdir() (line 1407 of sites/all/modules/boost/boost.module).
• Warning: date_timezone_set() expects parameter 1 to be DateTime, boolean given in format_date() (line 2133 of includes/common.inc).
• Warning: date_format() expects parameter 1 to be DateTimeInterface, boolean given in format_date() (line 2143 of includes/common.inc).