I want to add several new columns to a shapefile (v.db.addcolumn), using GRASS GIS 7.0.5, but the software don't allow me to change the "length" (set to 250), and it provides and error when asking to add the column ("Error: Unable to add column <1 integer>.; where "1" is the name of the column and "integer" is the type).
It already worked in other shapefiles, with the same version. I tried to create a new project, work with another shapefile but it does not seem to work anymore.
Does anyone know what may be the problem, and how to solve it?