"the element 'entityFramework' has invalid child element 'providers'. List of possible elementes expected: 'contexts'. "
"the element 'entityFramework' has invalid child element 'providers'. List of possible elementes expected: 'contexts'. "
In the project where your web config if set to main should contain this in your connections string providerName="System.Data.SqlClient"
example:
<connectionStrings>
<add name="nomeconexao" connectionString="" providerName="System.Data.SqlClient" />
</connectionStrings>
If you have questions post your code