General::noopen

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This message is generated when a requested file cannot be opened.
This message often indicates that the indicated file was not found.
The directories that are searched in an attempt to find an external file are listed in the value of the global variable $Path.
If you see this message, check the spelling and syntax for the name of the file, and check that the file is present in one of the directories listed in the value of $Path.
Off[message] switches off the message; On[message] switches it on. For example: Off[General::noopen].

An error occurs in this example if the specified file is not found on this computer:

An error occurs in this example because the context of the package is specified using forward quotes rather than backquote characters:

Evaluation of this input will load the Combinatorica Package if it has not already been loaded:

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