i dont know why i'm getting this error when i run ./bin/storage upgrade :
EXCEPTION: (AphrontQueryException) #1253: COLLATION 'utf8_general_ci' is not valid for CHARACTER SET 'binary' at [<phutil>/src/aphront/storage/connection/mysql/AphrontBaseMySQLDatabaseConnection.php:308] arcanist(head=master, ref.master=d8182cf55d50), phabricator(head=master, ref.master=18340d9ceffe), phutil(head=master, ref.master=b6200342f224) #0 AphrontBaseMySQLDatabaseConnection::throwQueryCodeException(integer, string) called at [<phutil>/src/aphront/storage/connection/mysql/AphrontBaseMySQLDatabaseConnection.php:275] #1 AphrontBaseMySQLDatabaseConnection::throwQueryException(mysqli) called at [<phutil>/src/aphront/storage/connection/mysql/AphrontBaseMySQLDatabaseConnection.php:181] #2 AphrontBaseMySQLDatabaseConnection::executeRawQuery(string) called at [<phutil>/src/xsprintf/queryfx.php:6] #3 queryfx(AphrontMySQLiDatabaseConnection, string, string) called at [<phabricator>/src/infrastructure/storage/management/PhabricatorStorageManagementAPI.php:219] #4 PhabricatorStorageManagementAPI::applyPatchSQL(string) called at [<phabricator>/src/infrastructure/storage/management/workflow/PhabricatorStorageManagementUpgradeWorkflow.php:109] #5 PhabricatorStorageManagementUpgradeWorkflow::execute(PhutilArgumentParser) called at [<phutil>/src/parser/argument/PhutilArgumentParser.php:396] #6 PhutilArgumentParser::parseWorkflowsFull(array) called at [<phutil>/src/parser/argument/PhutilArgumentParser.php:292] #7 PhutilArgumentParser::parseWorkflows(array) called at [<phabricator>/scripts/sql/manage_storage.php:171]