The Sloop Sail was not installed when you started the Rudder. It could have gotten uninstalled because you killed it or there was very low system memory.
The Rudder has now reinstalled the Sail (so everything should be fine!).

A disk-related error occurred while you were attempting to mount a disk.

An unknown error ocurred. Please report this error, along with the number, to the author.

There was an error processing Apple Events. Try again. If you get this error repeatedly, please contact the author.

Couldn't find the Sloop Sail. Put it in the Extensions Folder of the System Folder and restart. If you still get this message then the Sail may have uninstalled itself due to an error so please contact the author.

There was a communications error between the Sloop Rudder and Sail. Please report this to the author.

There was an error sending data between the Sloop Rudder and Sail. Try again. If you get this error repeatedly, please contact the author.

A memory error ocurred. You could try increasing the Rudder's memory partition. Please report this to the author.

There was a memory problem with Apple Events. Memory may be full so try increasing the Rudder's memory partition.

An external error. Please report this to the author.

Missing resource. Try increasing memory, throwing out the preferences file, starting with other extensions disabled, or installing a new copy of Sloop. If you get this error repeatedly, contact the author.

Couldn't allocate some memory. Memory may be full so try increasing the Rudder's memory partition.

An internal error. Please report this to the author.

Couldn't create a Routine Descriptor. Memory may be full so try increasing the Rudder's memory partition.

Your machine does not appear to support Apple Events. Apple Events are required in order to use the Sloop. Please upgrade your system to System 7 or higher.