https://community.appian.com/discussions/f/user-interface/22729/trying-to-display-data-in-read-only-gridCould not display interface. Please check definition and inputs. Interface Definition: Expression evaluation error at function a!gridField [line 497]: A grid component [label=&quot;null&quot;] has an invalid value for &quot;data&quot;. &quot;data&quot; must be sourced from a Recorden-USTelligent Community 12https://community.appian.com/thread/88911?ContentTypeID=1Thu, 09 Dec 2021 21:35:06 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:fe6f04ca-f0f5-4ad3-805b-090193fbef96ajhick<p>You&#39;re passing in the wrong data type for the data field of the a!gridField() function. There is a lot of information on this in the documentation:&nbsp;<a href="https://docs.appian.com/suite/help/21.4/Paging_Grid_Component.html">https://docs.appian.com/suite/help/21.4/Paging_Grid_Component.html</a>.</p> <p>But to get to the heart of the issue it looks like you&#39;re indexing to just &quot;id&quot; in the local!dataSubset variable which appears to return an array of Text. Not sure what the point of putting it into a datasubset is when you don&#39;t utilise it to sort anything and then in the data field of the a!gridField() function you index straight back to &quot;data&quot; again.</p> <p>I would pass into the data field the local!first variable and check out the documentation linked above.</p><div style="clear:both;"></div>