Argument 2 passed to think\\filesystem\\Driver::putFile() must be an instance of think\\File

ThinkPHP6.0上传文件，小文件可以正常上传，稍微大一点的文件就会报错

Argument 2 passed to think\\filesystem\\Driver::putFile() must be an instance of think\\File, null given

修改配置文件php.ini

# post_max_size = 8M
post_max_size = 100M

# upload_max_filesize = 2M
upload_max_filesize = 100M

参考 http://www.thinkphp.cn/topic/28078.html