Cannot using "Set Next Statement" when debug

What scripting language is your project using?
Was it working in your project using TestComplete earlier versions than v15.77? If so, I suggest you create a support incident.

As rraghvani​ pointed out the Notes section states: The “Set Next Statement” debugger command is not supported by Python and JavaScript (not JScript) engines.

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Refer to Setting Next Execution Point and take note of the Notes section. This has already been discussed in post https://community.smartbear.com/discussions/testcomplete-questions/getting-error-the-javascript-debugger-does-not-support-the-set-next-statement-co/276289