lpc4370 for keil5 load error: Erase Failed!

Hello! Please check the Information in the Build Output Window for additional information on the issue. The message box alone does not say much.

It looks like you are using this device:
    www.keil.com/.../

That page shows there is a "Dual Core CM4 Blinky" example. If your board has a similar layout to this our board, then you could use it too.
    https://www.keil.com/mcb4300/

Open the Pack installer, C:\Keil_v5\uv4\PackInstaller.exe

- On the top left of the window, for "Search", type "lpc4370" - the list below gets filtered.
- Select the device (entry with a green icon) from the list below – on the right side of the dialog updates with Software Packs relevant to this device.
- For the "Packs" tab, install the NXP:lpc4300_DFP pack (if necessary).
- On the top right of the screen, select the yellow "Examples" tab.
- On the "Dual Core CM4 Blinky (MCB4300)" row, click the "copy" button - a dialog pops up.
- Pick a directory, click both the check boxes, and press OK - a new Keil µVision session opens with the example.
- Build the project, Connect a USB cable to the board and start the debugger.