Problem with site

Question

Hello guys! 
 Our business is working in sites and till yesterday everything was fine. We have 5 tabs there and one of them is "My Cases" and these one is bugged. If you select this one an error occured: 
 " Expression evaluation error [evaluation ID = ECNGEJPM] in rule 'aa_taskgridloggedinowner' at function a!gridField_19r1 [line 12]: A grid component [label=&ldquo;&rdquo;] has an invalid value for &ldquo;columns&rdquo;. &ldquo;columns&rdquo; must not be empty or null." 
 I'd add that we havent change anything and this tab just got broken. Moreover when you press that tab a few times it works but it's very problematic. 
 Hope we can fix this quickly beasue it's production bug 
 
 Thank you in advance 
 David

Mike Schmitt · Answer

Sounds like you need to troubleshoot within that interface. What sort of data is it displaying, and how is it querying? Is there a chance that it's loading data from a view that's loading so slowly that the query times out and returns no data? You could also post your interface definition here ( please use the Insert -> Code feature to generate a text box to hold code and retain formatting ) if it's shareable, in case anyone here can spot any obvious errors or pitfalls.