If you are trying to request a report for a custom area but you cannot because there is an Area Failed warning, this is because the area you have created is too small for Local Insight to create a report for.
When you create a custom area by drawing on the map, you can draw an area as large or small as you like. However, in order to generate a report, the area must be large enough to produce data. For this, the area must cover at least 50% of the residential postcodes in at least one output area. On average an output area has an average population of about 310 residents. If you are not familiar with output areas or statistical geographies then take a look at this beginner's guide to statistical geographies. See below an example output area in Teeside.
Immediately after creating a custom area, the Report button will read as Report Unavailable and not be clickable until the area has been successfully created (this should take a couple of minutes).
However, after that process is complete, if the area you have created is too small, the Report button will read as Area failed. You will not be able to generate a report for that area. You then need to edit the area so that it is large enough to generate a report.