Sorry for your issue. This popup is usually more likely to appear in the following cases:
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The model position is far away from the origin position.
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Select another material to assign to the vegetation.
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The material is reused before it is loaded.
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The model is not selected when applying a material after absorbing the material.
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The model is a library model and does not support user-assigned materials.
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Apply material to (shown/hidden) paths.
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Materialize a section tool.