Error in contact integration by the api

This particular error is related to the interop used (Interop.CrmBE), which we could (internally) realize was caused by adding a new property to the class and some < in> builds caused compilation problems. The latest version of the DLL will certainly solve the problem.

As noted earlier, external developments should always have references "pointed" to ERP's ... \ CommonFiles (manually adding references to the project, or using the code provided above), making sure that the latest versions of interops .

The error is not related to the references you have in the project, but to the versions you are using. Confirm that you have the settings suggested in the image below for all SPRING INTEROPS.

Another thing you can do is ensure that all the assemblies in your project are loaded from the c: .. \ Common Files \ Spring folder. Note that this code should be the 1 thing to be evoked.

  static void Main()
    {
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);

        //Este handler tem que ser adicionado antes de existir qualquer referência para classes existentes nos Interop's,
        //isto é, no método Main() da aplicação NÃO PODERÁ EXISTIR DECLARAÇÕES DE VARIÁVEIS DE TIPOS EXISTENTES NOS INTEROPS.
        //Com este método, na pasta da aplicação não deverão existir os Interops e as referências para os mesmos deverão ser
        //adicionadas com Copy Local = False e Specific Version = false.
        AppDomain.CurrentDomain.AssemblyResolve += new ResolveEventHandler(CurrentDomain_AssemblyResolve);

        Application.Run(new Form1());
    }

/// <summary>
    /// Método para resolução das assemblies.
    /// </summary>
    /// <param name="sender">Application</param>
    /// <param name="args">Resolving Assembly Name</param>
    /// <returns>Assembly</returns>
    static System.Reflection.Assembly CurrentDomain_AssemblyResolve(object sender, ResolveEventArgs args)
    {
        string assemblyFullName;

        System.Reflection.AssemblyName assemblyName;

        const string PRIMAVERA_COMMON_FILES_FOLDER = "PRIMAVERA\SG900"; 

        assemblyName = new System.Reflection.AssemblyName(args.Name);
        assemblyFullName = System.IO.Path.Combine(System.IO.Path.Combine(System.Environment.GetFolderPath(Environment.SpecialFolder.CommonProgramFilesX86), PRIMAVERA_COMMON_FILES_FOLDER), assemblyName.Name + ".dll");

        if (System.IO.File.Exists(assemblyFullName))
            return System.Reflection.Assembly.LoadFile(assemblyFullName);
        else
            return null;
    }