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]