.net运行时报此错，如何解决

“/”应用程序中的服务器错误。
--------------------------------------------------------------------------------

试图加载格式不正确的程序。 (异常来自 HRESULT:0x8007000B)
说明: 执行当前 Web 请求期间，出现未处理的异常。请检查堆栈跟踪信息，以了解有关该错误以及代码中导致错误的出处的详细信息。

异常详细信息: System.BadImageFormatException: 试图加载格式不正确的程序。 (异常来自 HRESULT:0x8007000B)

源错误:


行 287:    {
行 288:        List<T> list = new List<T>();
行 289:        DataTable table = entity.Fill(where);
行 290:        foreach (DataRow row in table.Rows)
行 291:        {
 

源文件: F:\net\DQ\Bll\ExtClass.cs    行: 289

堆栈跟踪:


[BadImageFormatException: 试图加载格式不正确的程序。 (异常来自 HRESULT:0x8007000B)]
    System.Data.Common.UnsafeNativeMethods.OCILobCopy2(IntPtr svchp, IntPtr errhp, IntPtr dst_locp, IntPtr src_locp, UInt64 amount, UInt64 dst_offset, UInt64 src_offset) +0
    System.Data.OracleClient.OCI.DetermineClientVersion() +178

[InvalidOperationException: 尝试加载 Oracle 客户端库时引发 BadImageFormatException。如果在安装 32 位 Oracle 客户端组件的情况下以 64 位模式运行，将出现此问题。]
    System.Data.OracleClient.OCI.DetermineClientVersion() +459
    System.Data.OracleClient.OracleInternalConnection.OpenOnLocalTransaction(String userName, String password, String serverName, Boolean integratedSecurity, Boolean unicode, Boolean omitOracleConnectionName) +63
    System.Data.OracleClient.OracleInternalConnection..ctor(OracleConnectionString connectionOptions) +133
    System.Data.OracleClient.OracleConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningObject) +40
    System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnection owningConnection, DbConnectionPool pool, DbConnectionOptions options) +29
    System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject) +433
    System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject) +72
    System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) +457
    System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) +100
    System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +116
    System.Data.OracleClient.OracleConnection.Open() +40
    System.Data.Common.DbDataAdapter.QuietOpen(IDbConnection connection, ConnectionState& originalState) +31
    System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +112
    System.Data.Common.DbDataAdapter.Fill(DataTable[] dataTables, Int32 startRecord, Int32 maxRecords, IDbCommand command, CommandBehavior behavior) +162
    System.Data.Common.DbDataAdapter.Fill(DataTable dataTable) +115
    Winston.Data.Common.DataAccess.Fill(DataTable dt, String sql) +133
    Winston.Data.Common.DataAccess.Fill(String sql) +101
    Winston.Data.Common.Entity.Fill(Nullable`1 top, String paramfields, Where where, String order) +514
    Winston.Data.Common.Entity.Fill(String paramfields, Where where, String order) +98
    Winston.Data.Common.Entity.Fill(String paramfields, Where where) +71
    Winston.Data.Common.Entity.Fill(Where where) +72
    ExtClass.FillList(T entity, Where where) in F:\net\DQ\Bll\ExtClass.cs:289
    Bll.DataIndex.DataIndex.UploadAllIndex() in F:\net\DQ\Bll\DataIndex\DataIndex.cs:638
    Web.Global.Application_Start(Object sender, EventArgs e) in F:\net\DQ\Web\Global.asax.cs:21