Trying to set constraint - new primary key in table, but getting an error: column "amgettuple" does not exist (pgadmin3)

Question

I am creating a new table using pgadmin3 and when I click on constraints to add a primary key, I get this error:

I searched on google but I'm not finding this "amgettuple" issue. Does anyone know what this means? I am new to postgres and using pgadmin, just set it up an hour ago.

Postgres version: 9.6

pgadmin version: 1.22.2

linux mint 18

Answer 1

I am also using pgAdmin 3 and got that error. I fixed it by using the Query Tool:

ALTER TABLE table_name
ADD primary key (column_name);

Answer 2

Install pgAdmin 4. pgAdmin III was supported up to 9,5 version I think.