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ArmA 3 Terrain Builder, ArmA 3 Terrain Builder Support Forum

Error:

TxTImport - Wrong file format or source template not found.

It means you do not have template library for the object(s) you are trying to import. Always keep your template library's and terrain processor object / template names in sync.

If you create your own terrain builder object library's and copy paste the object / template names into terrain processor, you always know that they are matching.

You can track down the missing template name by importing objects to new layer, RMB layer → show info. If it's 150 objects for example, open the text file you are trying to import, line 151 is the missing object.