". Net" DbProviderFactories could not find the requested. NET Framework data provider. Problems that may not be installed "__.net

An error has been detected while running a history project today, DbProviderFactories cannot find the requested. Net Framework data Provider. may not be installed "issue. _providername is "Oracle.DataAccess.Client"
Solution: 1: Install ODAC client. 2: Modify the driver System.Data.OracleClient
If you still have an error copying C:\Windows\Microsoft.NET\Framework\v2.0.50727\Config\ DbProviderFactories node information in machine.config to
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Config\ Machine.config in the DbProviderFactories node. The node information is as follows.

<DbProviderFactories> <add name= "Oracle Data Provider for. NET" invariant= "Oracle.DataAccess.Client" Descri ption= Oracle Data Provider for. NET "Type=" Oracle.DataAccess.Client.OracleClientFactory, Oracle.dataaccess, version= 4.112.3.0, culture=neutral, publickeytoken=89b483f429c47342 "/> <add name=" Microsoft SQL Server Compact Data P Rovider 4.0 "invariant=" system.data.sqlserverce.4.0 "description=". NET Framework Data Provider for Microsoft SQL Server C Ompact "Type=" System.Data.SqlServerCe.SqlCeProviderFactory, System.Data.SqlServerCe, version=4.0.0.0, culture= Neutral, publickeytoken=89845dcd8080cc91 "/> <add name=" Odbc Data Provider invariant= "System.Data.Odbc" descr Iption= ". Net Framework Data Provider for Odbc" type= "System.Data.Odbc.OdbcFactory, System.Data, version=2.0.0.0, Culture=neutral, publickeytoken=b77a5c561934e089 "/> <add name=" OLE DB Data Provider "invariant=" System.Data.Ol EDb "description=". Net Framework Data Provider forOLE DB "Type=" System.Data.OleDb.OleDbFactory, System.Data, version=2.0.0.0, Culture=neutral, publickeytoken= b77a5c561934e089 "/> <add name=" OracleClient Data Provider "invariant=" System.Data.OracleClient "description=" The. Net Framework Data Provider for Oracle "type=" System.Data.OracleClient.OracleClientFactory, System.Data.OracleClient , version=2.0.0.0, culture=neutral, publickeytoken=b77a5c561934e089 "/> <add name=" SqlClient Data Provider "in Variant= "System.Data.SqlClient" description= ". Net Framework Data Provider for SQL Server" Type= " System.Data.SqlClient.SqlClientFactory, System.Data, version=2.0.0.0, Culture=neutral, publickeytoken= b77a5c561934e089 "/> <add name=" MySQL Data Provider "invariant=" MySql.Data.MySqlClient "description=". Net Fram Ework Data Provider for MySQL "type=" MySql.Data.MySqlClient.MySqlClientFactory, Mysql.data, version=6.0.0.0, culture= Neutral, publickeytoken=c5687fc88969c44d "/> </DbProviderFactories>