第一次安装 Phundament 时，我被要求应用 12 次迁移
Total 12 new migrations to be applied:
rights: m110402_195158_init
p3widgets: m110518_000000_init
p3media: m110719_000000_init
user: m110805_153437_installYiiUser
user: m110810_162301_userTimestampFix
rights: m111013_235001_p3items
p3widgets: m111028_000000_meta
p3widgets: m120309_021733_translation
p3pages: m120312_182502_init
p3pages: m121011_160518_fk_delete_cascade
p3media: m121011_170518_fk_delete_cascade
p3widgets: m121011_180518_fk_delete_cascade
我回答“是”并获得了这个错误：
Fatal error: Call to undefined function mb_strpos() in {myPathToP3}vendor/yiiext/migrate-command/EMigrateCommand.php on line 456
这对我的安装状态意味着什么？