Debugger returns cryptic error for watch

Debugger returns cryptic error for watch

(idb) whatis foo
complex*8 foo(1:256,-8:784,1:31)
(idb) watch variable foo
Warning: Watchpoint not set.

Why wasn't it set, and how can I set it?? Not sure if it has any bearing on the problem or not, but foo is part of a common block.

TIA

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