Details

This message is generated when the indicated function argument does not have the correct form to be a sequence specification.
Sequence specifications are used in Drop and Take to indicate sequences of subexpressions, and in StringDrop and StringTake to indicate sequences of characters.
Off[message] switches off the message; On[message] switches it on. For example: Off[General::seqs].

Examples

An error occurs because {i,1,2} is not a valid sequence specification:

This shows a valid sequence specification in Drop:

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