[Qgis-user] Provider Error

[Martin Bittens]

Hello QGIS Users.


I want to create a text field in an attribute table which contains some 
data points by using the field calculator. So I selected:


- Create a new field

- Output field name: Comment

- Output field type: Text (string)

- Output field length: 10

- Text input: 'Area 2'


The Output preview shows: 'Area 2'. By clicking on "OK" I receive the 
following message: "Could not add the new field to the provider"

My system is: Windows 10, QGIS2.18.21.

In the previous versions of QGIS I did not get that error when I added 
with the field calculator text fields in attribute tables.

Does somebody know a solution solving the error?


Thank you very much.


Martin


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