FAQ.md

@@ -3,6 +3,12 @@
     * If you are using windows, you have to add the option --keep-target-files for snakemake.
 * **I want to calculate something new with snakemake, but it tells me "nothing to be done".**
     * Snakemake does not recalculate files, which are already there. You must delete the file, which has the name of your desired output.
+# Common Backbone Error messages
+* If GAMS studio shows you an error, you can click on the error message and see in which backbone line the error occured. Helpful to find the cause of the error.
+* **Domain Violation Error**
+    *All grids, nodes, units etc. must be defined in the first sheets of the excel file (grid/node/unit etc.). A domain violation error indicates that in a later sheet (e.g. p_gnu_io), something was referenced, which was not defined in the first sheets. This can be either caused by a missing definition or by a spelling mistake (pay attention here: powerplant is for example not the same as power-plant).
+* **gdxxrw failed**
+    * The tool, that converts your excel sheet into GAMS data failed. That is usually caused by mistakes in the backbone command line (Did you spell the pathes right? Did you use the right amount of quotation marks?). Gdxxrw can also fail, if you have double entries in your excel sheet (e.g. twice the unit "lignite powerplant 1" in the unit sheet).
 # Backbone
 * **I have recently downloaded backbone, but it does not work with the Input files from the backbone Wiki**
     * The example data is prepared for the dev-branch of backbone. How to download it, you find here: https://gitlab.vtt.fi/backbone/backbone/-/wikis/Getting-started/Quick-Start