ERROR: invalid input syntax for integer:

Readers,

A database table was created with the command:

CREATE TABLE tablename (column1 bigint,date date,time time,column2 text)

a csv file was imported, of structure:

123456,2000-01-01,01:10,"sometext"

Using the command:

\copy tablename from file.csv

Causes the command terminal error:

 input syntax for integer: "123456,2000-01-01,01:10,"sometext""
CONTEXT:  COPY tablename, line 1, column column2: "123456

What is my mistake please?