bevyengine/bevy · error

We should have created uniform buffers for each `Data`

Error message

We should have created uniform buffers for each `Data`

What it means

Panic during bind group preparation: the number of created uniform buffers did not line up with the Data entries for an unprepared bind group, so iteration ran short. Indicates a mismatch between queued uniform-buffer creation and binding resources; normally an internal invariant.

Source

Thrown at crates/bevy_render/src/material_bind_groups.rs:2516

                    label: Some(&label),
                    contents: &unprepared_bind_group.data_buffer
                        [(data_range.start as usize)..(data_range.end as usize)],
                    usage: BufferUsages::COPY_DST | BufferUsages::UNIFORM,
                });
                uniform_buffers.push(uniform_buffer);
            }

            // Create bind group entries.
            let mut bind_group_entries = vec![];
            let mut uniform_buffers_iter = uniform_buffers.iter();
            for (index, binding) in unprepared_bind_group.binding_resources.iter() {
                match *binding {
                    UnpreparedBindingResource::Data(_) => {
                        bind_group_entries.push(BindGroupEntry {
                            binding: *index,
                            resource: uniform_buffers_iter
                                .next()
                                .expect("We should have created uniform buffers for each `Data`")
                                .as_entire_binding(),
                        });
                    }
                    _ => bind_group_entries.push(BindGroupEntry {
                        binding: *index,
                        resource: binding.get_binding(fallback_buffer, shader_buffer_assets),
                    }),
                }
            }

            // Create the bind group.
            let bind_group = render_device.create_bind_group(
                self.label,
                &pipeline_cache.get_bind_group_layout(&bind_group_layout),
                &bind_group_entries,
            );

            self.bind_groups[*bind_group_index as usize] =

View on GitHub (pinned to 396ca72708)

Solutions

1. Report as a Bevy engine bug with a reproducing project
2. Check that Data bindings in the material are declared consistently

When it happens

Trigger: Thrown at crates/bevy_render/src/material_bind_groups.rs:2516 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of bevyengine/bevy@396ca72708 (2026-08-20). Data as JSON: /api/errors/63780c3396c806aa. Report an issue: GitHub.