exporting and importing .sql in pgAdmin 4

m trying to import a table using pgAdmin 4
I backed up the tables by right click on table, then in menu click on
backup, then in Format choice Plain and save file as
postgresql_food_table.sql 
The back up process ran successfully 
I removed the table
I tried to import it back by using Query Tool in Tool tab. When I tried to
execute it, it gives me this error :
<http://www.postgresql-archive.org/file/t352153/PgAdmin_4_importing_tables_error.png> 


Anyone knows what I did wrong? Thanks in advance



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