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XSLT: issue

ERROR: exerr:ERROR XPTY0004: The actual cardinality for parameter 1 does not match the cardinality declared in the function's signature: jbic:transform($node as item(), $stylesheet as item(), $parameters as item()?) as item()*. Expected cardinality: exactly one, got 0. [at line 64, column 35, source: /db/modules/online.benjamins.com/app2.xqm] In function: jbic:transform($node as item(), $stylesheet as item(), $parameters as item()?) as item()* [64:19:/db/apps/xmldb-intranet/xqlmod/intranet-common.xqm]. XPTY0004: The actual cardinality for parameter 1 does not match the cardinality declared in the function's signature: jbic:transform($node as item(), $stylesheet as item(), $parameters as item()?) as item()*. Expected cardinality: exactly one, got 0. /db/modules/online.benjamins.com/app2.xqm 64