HP 83751A User Manual page 216

Error Messages
-276 Macro recursion error
Indicates
could not be executed because the device found it to be recursive.
(See IEEE 488.2, 10.7.6.6).
-277 Macro redefinition not allowed
Indicates that a syntactically legal macro label in the *DMC
command could not be executed because the macro label was
already dehned. (See IEEE 488.2, 10.7.6.4).
-278 Macro header not found
Indicates that a syntactically legal macro label in the *GMC? query
could not be executed because the header was not previously
that a syntactically legal macro program data sequence