Metadata Error : Error while opening project

While trying to open some sample soa project in Jdeveloper,Icame across with following errors as listed below :- 

Error: oracle.fabric.common.FabricException: oracle.mds.config.MDSConfigurationException: MDS-01330: unable to load MDS configuration document  
  
MDS-01329: unable to load element "persistence-config"

MDS-01370: MetadataStore configuration for metadata-store-usage "mstore-usage_1" is invalid.    

MDS-00503: The metadata path "C:\Oracle\Middleware\jdeveloper\integration" does not contain any valid directories.

: MDS-01330: unable to load MDS configuration document  
  
MDS-01329: unable to load element "persistence-config"

MDS-01370: MetadataStore configuration for metadata-store-usage "mstore-usage_1" is invalid. 
   
MDS-00503: The metadata path "C:\Oracle\Middleware\jdeveloper\integration" does not contain any valid directories.

: oracle.mds.config.MDSConfigurationException: MDS-01330: unable to load MDS configuration document    

MDS-01329: unable to load element "persistence-config"

MDS-01370: MetadataStore configuration for metadata-store-usage "mstore-usage_1" is invalid.    

MDS-00503: The metadata path "C:\Oracle\Middleware\jdeveloper\integration" does not contain any valid directories.

: MDS-01330: unable to load MDS configuration document 
   
MDS-01329: unable to load element "persistence-config"

MDS-01370: MetadataStore configuration for metadata-store-usage "mstore-usage_1" is invalid.    

MDS-00503: The metadata path "C:\Oracle\Middleware\jdeveloper\integration" does not contain any valid directories.
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FIX: solution - open the .adf\META-INF in your project and give th ecorrect path of j developer integration folder 
eg in my case it was   : C:\Oracle\Middleware\Jdeveloper\jdeveloper\integration

It works in my case hope it also help you out.