Troubleshooting
Common issues and checks
Use this page when a simulation warning appears, results are not available, or exported data does not behave as expected in downstream software.
Gaps and overlaps warning
Gaps and overlaps indicate that the section geometry may not assign material regions clearly.
What it means
- Gaps are undefined regions between section boundaries or layer wires.
- Overlaps are conflicting regions where two or more material areas occupy the same space.
Common causes
- DXF section boundaries are not closed or continuous.
- Layer wires intersect or cross incorrectly.
- Duplicate or very small sliver lines are present.
- Imported 3D data contains inconsistent surfaces or solids.
How to check
Open the Visualiser and inspect detected markers:
- red markers indicate gap points;
- blue markers indicate overlap points.
How to fix
- Repair large or repeated gaps before running the simulation.
- Correct visible overlaps where material boundaries cross.
- Remove duplicate or unnecessary geometry.
- Pay particular attention to issues near the slope face, toe, crest, or expected failure region.
When it may be acceptable: A few small isolated markers away from the critical slope region may not significantly affect the result, but the geometry should still be reviewed carefully.
Related workflow section Read the detailed gaps and overlaps checklist.
OSA search region issues
The OSA search region controls where the optimiser searches for the optimal slope profile.
Problem: OSA triangle extends outside the model
This can happen when the crest point is too close to the outer edge of the section or terrain. The calculated slope profile may project outside the available ground surface.
How to fix
- Move the crest point further inside the section.
- Check slope height and OSA limits.
- Confirm that the green triangular search region remains within the available ground or material area.
Problem: OSA range is too narrow
If the minimum and maximum OSA values create only a very small search range, the optimiser has limited flexibility and may not explore enough possible profiles.
How to fix
- Review Min/Max OSA values.
- Adjust crest position if necessary.
- Check that the search range is realistic for the section geometry.
Practical tip: Position the crest slightly further inside the section boundary than you think is necessary, then confirm that the OSA search region remains inside valid material.
Related workflow section Read the crest point and OSA search region guidance.
Simulation does not start
Most start-up issues are caused by missing setup, missing section data, or unresolved input warnings.
Check the following:
- A valid section is selected.
- Required bench, rock, and general section properties are defined.
- A simulation folder has been selected.
- The user profile is configured under
Tools -> Settings -> Account. - The selected section has valid geometry and required inputs.
- Any warnings have been reviewed before continuing.
Cloud simulation note: Slope Optimiser runs simulations on the cloud, so the user account/profile must be configured before cloud runs can be submitted.
Related workflow section Review the full simulation setup workflow.
Results or exports do not look correct
Review result folders, export options, and downstream import requirements.
Results are not available
Check that:
- the simulation was submitted successfully;
- the correct simulation folder is selected;
- Fetch results has been used to update the local results;
- the results folder contains logs and output files.
Exported DXF does not import as expected
For RS2 workflows, use the Local XY export method when a 2D section is required. Some external applications may still require manual cleanup or additional boundary definition after import.
Block model output does not look correct
Check that:
- the section is associated with 3D stratigraphy;
- block dimensions are appropriate for the model scale;
- exported fields are mapped correctly in downstream software;
- slope-angle fields are imported as numeric attributes where required.