Dropping the table was not an option for me, since I'm keeping a running log. If every time I needed to insert I had to drop, the table would be meaningless.
My error was because I had a couple columns in the create table statement that were products of other columns, changing these fixed my problem. eg
create table foo (
field1 as int
,field2 as int
,field12 as field1 + field2 )
create table copyOfFoo (
field1 as int
,field2 as int
,field12 as field1 + field2) --this is the problem, should just be 'as int'
insert into copyOfFoo
SELECT * FROM foo