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AnEntryPointNotFoundException exception is thrown when the common language runtime is unable to load an assembly because it cannot identify the assembly's entry point. This exception can be thrown under the following conditions:

The common language runtime is unable to locate an application entry point (typically a Main method) in an executable assembly. The application entry point must be a global or static method that has either no parameters or a string array as its only parameter. The entry point can return void, or it can return an Int32 or UInt32 exit code. An application assembly cannot define more than one entry point.

The call to a function in a Windows DLL cannot be resolved because the function cannot be found. In the following example, an EntryPointNotFoundException exception is thrown because User32.dll does not include a function named GetMyNumber.

The call to a function in a Windows DLL cannot be resolved because the name used in the method call does not match a name found in the assembly. Frequently, this occurs because the DllImportAttribute.ExactSpelling field is either implicitly or explicitly set to true, the called method includes one or more string parameters and has both an ANSI and a Unicode version, and the name used in the method call does not correspond to the name of this ANSI or Unicode version. The following example provides an illustration by attempting to call the Windows MessageBox function in User32.dll. Because the first method definition specifies CharSet.Unicode for string marshaling, the common language looks for the wide-character version of the function, MessageBoxW, instead of the name used in the method call, MessageBox. The second method definition corrects this problem by calling the MessageBoxW instead of the MessageBox function.

You are trying to call a function in a dynamic link library by its simple name rather than its decorated name. Typically, the C++ compiler generates a decorated name for DLL functions. For example, the following C++ code defines a function named Double in a library named TestDll.dll.

You are attempting to call a method in a managed assembly as if it were an unmanaged dynamic link library. To see this in action, compile the following example to an assembly named StringUtilities.dll.

Then compile and execute the following example, which attempts to call the StringUtilities.SayGoodMorning method in the StringUtilities.dll dynamic link library as if it were unmanaged code. The result is an EntryPointNotFoundException exception.

To eliminate the exception, add a reference to the managed assembly and access the StringUtilities.SayGoodMorning method just as you would access any other method in managed code, as the following example does.

You are trying to call a method in a COM DLL as if it were a Windows DLL. To access a COM DLL, select the Add Reference option in Visual Studio to add a reference to the project, and then select the type library from the COM tab.

To connect to an Oracle database with Power BI Desktop, the correct Oracle client software must be installed on the computer running Power BI Desktop. The Oracle client software you use depends on which version of Power BI Desktop you've installed: 32-bit or 64-bit. It also depends on your version of the Oracle server.

In the Oracle database dialog that appears, provide the name of the Server, and select OK. If a SID is required, specify it by using the format: ServerName/SID, where SID is the unique name of the database. If the ServerName/SID format doesn't work, use ServerName/ServiceName, where ServiceName is the alias you use to connect.

These errors might occur if the Oracle client either isn't installed or isn't configured properly. If it's installed, verify that the tnsnames.ora file is properly configured and you're using the proper net_service_name. You also need to make sure that the net_service_name is the same between the machine that uses Power BI Desktop and the machine that runs the gateway. For more information, see Install the Oracle client.

You might also encounter a compatibility issue between the Oracle server version and the Oracle Data Access Client version. Typically, you want these versions to match, as some combinations are incompatible. For instance, ODAC 12.x does not support Oracle Server version 9.

If you downloaded Power BI Desktop from the Microsoft Store, you might be unable to connect to Oracle databases because of an Oracle driver issue. If you encounter this issue, the error message returned is: Object reference not set. To address the issue, do one of these steps

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