Identity_insert is set to OFF error even-though it is set to ON

Question

I get an error

Cannot insert explicit value for identity column in table 'Table1' when IDENTITY_INSERT is set to OFF

I have set the IDENTITY_INSERT to ON by using the query SET IDENTITY_INSERT [Database1].[dbo].[Table1] ON, but still i get this error. In my case I am trying to copy the data of one table to an another so copying the ID. I have set the identity_insert to ON. I do not know why i get this error.

CREATE TABLE [Database1].[dbo].[Table1]
   (ID int IDENTITY,
    Machinetyp nvarchar(255),
    Flaeche float not null,
    Losnumberr nvarchar(255),
    Current float not null,
    RK float not null,
);
GO
SET IDENTITY_INSERT [Database1].[dbo].[Table1] ON