Unable to update or insert values table with DateTime column defaulted to GETDATE

I have atlered table by adding Datetime column. This column is not null and also default value from GETDATE().

ALTER TABLE myTable ADD myDateColun DATETIME NOT NULL DEFAULT (GETDATE())

I'm trying to update, I'm unable to update or insert values table

update  myTable set myDateColun = GETDATE() where id = someNumber

Its throwing me SQL error

Column name or number of supplied values does not match table definition.

Note: This table has trigger defined on insert and delete scenario for data, which updates synonym table linked to this table in other database.

Any ideas what can be reason for SQL errors in above scenario?