Couldn't add a column to attribute table (GPX layer) | QGIS

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Running QGIS 2.10.1 on Ubuntu 14.04 x64.

Going to add a column to the attribute table (GPX layer) but couldn't select any type. Then, failed - "Failed to add field 'NameTest' of type. Is the field name unique?".

Need to provide types firstly before adding a column? How to set it?

Thanks!






Reference
https://docs.qgis.org/2.2/en/docs/training_manual/create_vector_data/actions.html



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