Object reference not set to an instance of the Object.

Question

Hi

I have below code i am getting error - Object reference not set to an instance of the Object.

oApplication.MessageBox("Sap B1 Connected");

SAPbobsCOM.Company oCompany = new SAPbobsCOM.Company();
oCompany.Server = "10.0.1.28:30013";
oCompany.DbServerType = BoDataServerTypes.dst_HANADB;
oCompany.CompanyDB = "LIVE";
oCompany.UserName = "manager";
oCompany.Password = "123";
oCompany.language = BoSuppLangs.ln_English;
oCompany.UseTrusted = true;

int connectionResult = oCompany.Connect();
if (connectionResult != 0)
{
    throw new Exception("Error connecting to SAP Business One: " + oCompany.GetLastErrorDescription());
}

oApplication.MessageBox("Sap B1 Connected");

Thanks

Muhammad Imran Ansari · Answer

Hello Ramco, The error Object reference not set to an instance of an object typically occurs when you try to access a member of an object that is null . In your code, the issue is likely with the oApplication object, which is not initialized before being used in the MessageBox method. Here’s how you can fix the issue: Steps to Resolve: Initialize oApplication: Ensure that oApplication is properly instantiated before using it. If oApplication is a reference to the SAP Business One Application object, you need to initialize it correctly. Check for null: Add a null check before using oApplication to avoid the NullReferenceException. Debugging: Add logging or debugging to ensure that oApplication is properly initialized. // Updated Code // Ensure oApplication is properly initialized SAPbouiCOM.Application oApplication = null; //If oApplication is supposed to be the SAP Business One Application object, you need to initialize it properly. For example: oApplication = (SAPbouiCOM.Application)SAPbouiCOM.Framework.Application.SBO_Application; // Check if oApplication is initialized before using it if (oApplication != null) { oApplication.MessageBox("Sap B1 Connected"); } else { throw new Exception("oApplication is not initialized."); } SAPbobsCOM.Company oCompany = new SAPbobsCOM.Company(); oCompany.Server = "10.0.1.28:30013"; oCompany.DbServerType = BoDataServerTypes.dst_HANADB; oCompany.CompanyDB = "LIVE"; oCompany.UserName = "manager"; oCompany.Password = "123"; oCompany.language = BoSuppLangs.ln_English; oCompany.UseTrusted = true; int connectionResult = oCompany.Connect(); if (connectionResult != 0) { throw new Exception("Error connecting to SAP Business One: " + oCompany.GetLastErrorDescription()); } // Check if oApplication is initialized before using it if (oApplication != null) { oApplication.MessageBox("Sap B1 Connected"); } else { throw new Exception("oApplication is not initialized."); } Good Luck!

Tuhin Paul · Answer

Here’s the updated code with additional error handling and logging: try { // Initialize the SAP Business One Company object SAPbobsCOM.Company oCompany = new SAPbobsCOM.Company(); // Set connection properties oCompany.Server = "10.0.1.28:30013"; oCompany.DbServerType = SAPbobsCOM.BoDataServerTypes.dst_HANADB; oCompany.CompanyDB = "LIVE"; oCompany.UserName = "manager"; oCompany.Password = "123"; oCompany.language = SAPbobsCOM.BoSuppLangs.ln_English; oCompany.UseTrusted = true; // Attempt to connect int connectionResult = oCompany.Connect(); if (connectionResult != 0) { string errorMessage = $"Error connecting to SAP Business One: {oCompany.GetLastErrorDescription()}"; throw new Exception(errorMessage); } // Success message oApplication.MessageBox("SAP B1 Connected"); } catch (Exception ex) { // Log and display the error oApplication.MessageBox($"An error occurred: {ex.Message}"); Console.WriteLine($"Error: {ex.Message}"); } steps to resolve: Step 1: Verify SAP Business One DI API Installation Ensure that the SAP Business One DI API is installed on your machine. Check the installation directory (e.g., C:\Program Files (x86)\SAP\SAP Business One DI API ) to confirm that the SAPbobsCOM.dll file exists. If it is not installed, download and install the correct version of the SAP Business One DI API from the SAP support portal. Step 2: Set the Correct Platform Target Open your project in Visual Studio. Go to Project Properties → Build tab. Set the Platform Target to x86 (32-bit). This ensures that your application runs in a 32-bit environment, compatible with the SAP Business One DI API. Step 3: Register the SAPbobsCOM Library Open a Command Prompt as Administrator. Run the following command to register the SAPbobsCOM.dll file: cmd Copy 1 regsvr32 "C:\Program Files (x86)\SAP\SAP Business One DI API\DI API\x86_64\SAPbobsCOM.dll" Replace the path with the actual location of the SAPbobsCOM.dll file on your system. Step 4: Verify Trusted Authentication In your code, you have set oCompany.UseTrusted = true; . This means you are using Windows Authentication to connect to the SAP Business One database. Ensure that the user running the application has the necessary permissions to access the SAP Business One database. Step 5: Test the Connection After making the above changes, test the connection again by running your application.

Tuhin Paul · Answer

The error indicates that there is an issue with loading the SAP Business One COM object ( SAPbobsCOM.Company ). This typically happens when there is a mismatch between the architecture (32-bit vs. 64-bit) of your application and the SAP Business One libraries. Root Cause Architecture Mismatch : The SAPbobsCOM.Company object is part of the SAP Business One DI API, which is typically installed as a 32-bit COM library. If your application is running in a 64-bit environment, it will fail to load the 32-bit COM library, resulting in the error. Missing or Incorrect Installation of SAP Business One DI API : The SAP Business One DI API might not be installed correctly on your machine, or the required registry entries for the COM object might be missing. Incorrect Platform Target in Your Project : If your project is targeting "Any CPU" or "x64," it will attempt to load the 64-bit version of the COM library, which does not exist.

Jignesh Kumar · Answer

Hello Ramco, You are using the oApplication object, which is currently null. This causes an error due to the null reference. You need to initialize the object before using it. Check this line : oApplication.MessageBox("Sap B1 Connected");

Daniel Wright · Answer

It seems like the error "Object reference not set to an instance of the Object" is often encountered in programming when you try to access or use an object that has not been initialized or set to a valid instance. In the provided code snippet, the error can arise from the object `oApplication` not being initialized before calling the `MessageBox` method. To resolve this issue, you need to ensure that `oApplication` is properly initialized before using it. Below is an example of how you can initialize `oApplication`: SAPbouiCOM.Application oApplication = new SAPbouiCOM.Application(); You can add this line before trying to call the `MessageBox` method to avoid the "Object reference not set to an instance of the Object" error. Additionally, you can also check if any other objects in your code are not initialized properly and ensure that they are correctly set to valid instances before using them. This proactive approach will help prevent similar errors in the future. If you have any other questions or need further clarification, feel free to ask!

Ramco Ramco · Answer

Hi It is giving error - Name Value Type Message "Retrieving the COM class factory for component with CLSID {49B5C554-9A6B-4530-A90D-2B51B27BCEDA} failed due to the following error: 800700c1 is not a valid Win32 application. (0x800700C1)." string Thanks