I submitted a test task that seemed to work ok: https://ct.skia.org/queue/
What parameters are you specifying?

Not able to look at the logs right now because not on VPN.

Can you try this patch? https://codereview.chromium.org/1812153002

Both wkorman and I were able to repro with it. (Apply to chromium)

Yeah, I literally pasted '1812153002' into the 'Chromium Git patch' field, and clicked 'Queue Task', and I get a 500 server error every time.

Using https://codereview.chromium.org/1812153002 in ct.skia.org worked for me.

Applying the patch failed though:
https://uberchromegw.corp.google.com/i/skia-ct-master//run_chromium_perf_on_workers.build101-m5.chrome-bot.log.INFO.rmistry-20160321124932

Could you try it again? maybe it was a transient issue with Rietveld.

Also, are you signed in to ct.skia.org ?

When I am not signed in I get the issue described in https://codereview.chromium.org/1812153002#msg7 I will take a look at why the popup is blank.

Renaming the bug.

Reproducable in both ct.skia.org and push.skia.org when users are not logged in.

Caused by https://codereview.chromium.org/1704713002/diff/60001/go/util/http.go
All callers which do not specify a message will see this bug. The previous behavior displayed the error message and thus not all callers needed to specify a message.

Sorry, I should have thought of this problem when reviewing https://codereview.chromium.org/1704713002.

The following revision refers to this bug:
  https://skia.googlesource.com/buildbot.git/+/ace4c3c09b2c97d0fcf045d727473665348e4bf8

commit ace4c3c09b2c97d0fcf045d727473665348e4bf8
Author: rmistry <rmistry@google.com>
Date: Mon Mar 21 19:52:57 2016

Update callers of httputils.ReportError to specify message. Use "Unknown error" when message is not specified so that the
error toast is never blank.

Context is in https://bugs.chromium.org/p/chromium/issues/detail?id=596183#c9

BUG= chromium:596183 

Review URL: https://codereview.chromium.org/1820863002

[modify] https://crrev.com/ace4c3c09b2c97d0fcf045d727473665348e4bf8/ct/go/ctfe/chromium_builds/chromium_builds.go
[modify] https://crrev.com/ace4c3c09b2c97d0fcf045d727473665348e4bf8/ct/go/ctfe/chromium_perf/chromium_perf.go
[modify] https://crrev.com/ace4c3c09b2c97d0fcf045d727473665348e4bf8/ct/go/ctfe/task_common/task_common.go
[modify] https://crrev.com/ace4c3c09b2c97d0fcf045d727473665348e4bf8/datahopper_internal/go/datahopper_internal/main.go
[modify] https://crrev.com/ace4c3c09b2c97d0fcf045d727473665348e4bf8/go/httputils/http.go
[modify] https://crrev.com/ace4c3c09b2c97d0fcf045d727473665348e4bf8/push/go/push/main.go

Pushed new releases and verified that it now works on ct.skia.org and on push.skia.org
Marking as fixed.