Content originally posted in LPCWare by vtw.433e on Wed May 18 06:41:35 MST 2016
You must select the MCU you are using, not some random alternative!
Yes, choose the exact MCU you are using in MCU Settings.
When you first create a project, you get to choose the MCU very early in the Wizard. If you have imported a project that is set up for a different MCU, it most likely will not work for the LPC11U68 (and changing the MCU won't fix it - the memory and peripherals are going to be different and so code for another MCU is highly unlikely to work)
P.S. Suggest you read the IDE User Guide which will help you get started. You find a PDF in your installation, or in the Help-Help Contents menu.