Failure Dashboard Saving

[スズキ]

Hi.

I'm using JIRA Data Center.

When trying to change a dashboard, an Massage box apprears and says:

Sorry your changes to this dashboard sould not be saved. Your dashboard may be out of sync with the server: please reload the page.

But, I cant saolve this problem by reloading the page.
I looked for Logs on it, but there isn't any information.

How can i do for this?

[Dave Liao · Accepted solution]

@スズキ - what version of Jira Data Center are you using? (Check the footer while you're viewing a dashboard.)

Are the dashboard gadgets loading properly? If you see any that aren't loading (share any error messages), you could try removing the troublesome gadget/s.

[スズキ]

Thank you. 

The JIRA Version is v10.7.1 .

Gadgets look loaded properly. they shows no errors.
When clicking "Add gadget" on Add a gadget popup screen, it reacts nothing.
And at Edit layout screen, the massage written in my question appears.