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What does No Cortex-M Device found in JTAG chain mean?

When I try to execute the Blinky program

On menu, select Debug -> Start/Stop Debug Session

I get a dialog box:

JLink - Cortex-M Error

No Cortex-M Device found in JTAG chain.

Please check the JTAG cable and the connected devices.

The LPC-Link2 board is connected to the LPC4330-Xplorer board correctly.

Blinky compiles with no errors.

What should I look for?

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