ASP EntityDataSource Cofiguration Error

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ASP

.NET

Hello All.

i'musing EntityDataSource to bring data from database and put it in list view. but when i configure data source for EntityDataSource and select connection name it give me this error message:

"the metadata specified in the connection string could not be loaded consider rebuilding the web project to build
assemblies that my contain metadata. the following error(s) occurred:
unalble to load the spefied metadata resource."

how i can solve it??!!