Build task fail, and can't cancel, block all the new task with the same TAG

Docker Hub
1

one of my build task fail (actually finished build), such as below:

task-fail
task-fail2350×460 29.2 KB

how can I fix this??

2

the build log for this task:

build-finished
build-finished2524×1742 387 KB

at the end of the log: Build finished

3

the fail task block all the new task with the same tag, it means I can’t autobuild the image with the same TAG again…

block-the-same-tag-task
block-the-same-tag-task2494×518 49 KB

also, I try remove the built tag(6.0) in the “Build configurations” page and re-config it again, the problem is the same(the build task are not removed).