The tile could not be found, you may be missing a dashboard pack
You may see this error if you are viewing a dashboard that references tiles found in a dashboard pack that you do not have installed.
To fix this issue, install the missing dashboard pack and the error should disappear. If it does not disappear immediately, you may need to reload your dashboard packs, see Reloading dashboard packs.
In the above screenshot, the quickstarts tile is missing, this can be found in the QuickStart dashboard pack which is installed via the Import dashboard packs page within Squared Up.