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The Checker is the last section of the details column. It lists what is wrong with the structure. Errors block the export. Warnings do not.

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Read the Checker

Two badges in the header count the problems: red for errors, orange for warnings. With none, the section reads Ready to export. Errors come first in the list. The list shows the problems of the active part, but an error in any part blocks the export. Click a row to select the culprit: the room, portal, prop, light, or opening in the view. A row about textures selects the faces and switches to Edit geometry, so you can apply a texture. Some rows point at no piece, such as the empty-structure error, the “No Entrance” error, and the lodDist warning. They only describe what to fix.
Details column with six faces selected and the Material section with a texture, Library, and Import

A row about missing textures selects those faces and opens the Material section.

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When the export is blocked

Press Ctrl+E or Export while an error blocks it, and a strip appears over the view: Export blocked: … problem(s) prevent writing the resource. Click one to mark the culprit. It lists the blocking rows, and each one works like a row in the Checker. The strip goes away when the problems are fixed or when you close it.
Plan view with a room and a strip listing no Entrance, an unreachable room, and faces without a texture

The Export blocked strip over a Plan view, with five problems.

An empty structure is skipped when the project has other content. A structure that only has props or geometry exports without an interior; the Checker only warns.
Portals and openings appear by internal id in the Checker and the tree. Click the row instead of looking for the id.
Room and portal messages are explained in Rooms and Portals and openings. The rest are below.

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Troubleshooting

An error: the structure has no rooms, props, or geometry. Draw a room with Create room, or add content.
A warning: there are props or geometry but no rooms. Add a room if you want an interior.
A warning: the structure replaces map models. Do not run a second resource that replaces the same map files.
An error for faces of the generated shell. Click the row, then Library › Apply texture in Material. See Textures.
An error: the texture lost its texture dictionary. Click the row and choose the texture again from the Library.
A warning, expected for an imported interior. Draw rooms to replace the shell. See Create and import.
An error: the outline cannot produce a floor. Fix the outline. See Rooms.
An error: too many pairs of room and collision material. Use fewer collision materials.
A warning: the structure name matches a game interior. Rename the structure unless you want to replace the original. An imported interior is exempt.
A warning: the modifier’s box is outside every room. Move the box.
A warning for a re-exported imported interior. It tells you the value that will be written, from the Entrances you marked.
An error. Read the reason after the colon and fix that piece.