files/styles/** /public 下没有生成文件

admin/reports/dblog报错

image 04/17/2018 - 10:56 Unable to generate the derived image located at public… admin

image 04/17/2018 - 10:56 Image scale failed using the gd toolkit on public://… admin

php 04/17/2018 - 10:56 Warning: imagesy(): supplied resource is not a valid… admin
php 04/17/2018 - 10:56 Warning: imagesx(): supplied resource is not a valid… admin
image 04/17/2018 - 10:56 Invalid resource argument admin
php 04/17/2018 - 10:56 Warning: imagecopyresampled() expects parameter 2 to be… admin
php 04/17/2018 - 10:56 Warning: imagesy() expects parameter 1 to be resource,… admin
php 04/17/2018 - 10:56 Warning: imagesx() expects parameter 1 to be resource,… admin