pipe.input_unresolved

A pipe could not read a value it needs


Type	`https://mthds.ai/errors/pipe.input_unresolved`
Family	`pipe`: A pipe failing at run time because of what the method does.
Domain	`method`: the method's author acts, by changing the method
Retry	`no`: repeating the operation fails the same way
HTTP status	`422`
Raised as	a problem document, sent as the body of an HTTP response or kept in a run's record

What it means

A nested pipe's input is absent, or of the wrong kind, because an earlier step did not produce it.

What to do

Follow the variable back to the step that should store it, and check that the step runs and stores it under that name before the pipe reads it.

Next steps

A problem carries the step aimed at whoever reads it: the first when its reader is the domain's actor, the method's author, and the second for any other reader.

Reader	Kind	Detail
The domain's actor	`change_method`	Make an earlier step produce '`{variable}`' for pipe '`{pipe}`', then run the method again.
Any other reader	`contact_owner`	Ask the method's owner to make an earlier step produce '`{variable}`'.

Detail

The problem's detail is written from this template, filled with the occurrence's parameters:

Pipe '{pipe}' could not read '{variable}', which an earlier step should have produced.

Parameters

Every parameter is present on every occurrence of the code.

Name	Type	Description
`pipe`	`identifier`	The pipe that could not read its input.
`variable`	`identifier`	The input it could not read.