ATTRIBUTE _ WRONG _ INTF error in idoc adapter

hai

iam creating file to idoc scenario in that

iam copying the CREMAS in to XSD file

and chenge the occurence of name1

filed.

and this xsd file iam using at reciving side interface

my reciver adapter is idoc adapter

sender adapter is file adapter

when i configure this

iam getting this error

<SAP:Category>XIAdapter</SAP:Category>

<SAP:Code area="IDOC_ADAPTER">ATTRIBUTE_WRONG_INTF</SAP:Code>

<SAP:P1>CRMAS_IF</SAP:P1>

<SAP:P2 />

<SAP:P3 />

<SAP:P4 />

<SAP:AdditionalText />

<SAP:ApplicationFaultMessage namespace="" />

<SAP:Stack>Unable to interpret IDoc interface CRMAS_IF</SAP:Stack>

<SAP:Retry>M</SAP:Retry>

</SAP:Error>

so pls any body can help me

what is this error