Optional
cause: ErrorRetrieves a ProgramError from a given error name
or null
if the error name is not recognized.
Optional
cause: ErrorA method that returns true
if the program is available on the given cluster.
If the same program is available on multiple clusters but using different public keys,
multiple Program instances must be registered such that the isOnCluster
method
returns true
for the appropriate cluster.
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Retrieves a ProgramError from a given error code or
null
if the error code is not recognized.