Syncfusion moved to a several years ago. Unlike older components that relied on MSI installers to validate your machine, modern Syncfusion libraries (ASP.NET Core, Blazor, Flutter, React, etc.) require a programmatic key registration within your code. The warning persists usually because: The license key is missing from your startup logic.
How to Fix Syncfusion Trial License Key Errors: A Complete Troubleshooting Guide
Before changing your code, ensure you have a valid key that matches your current development environment. Log in to your . Navigate to the License & Downloads section. Click on Get License Key .
Choose the exact and Version matching your installed NuGet packages. Copy the generated string. Step 2: Register the Key by Framework syncfusion trial license key fix
var licenseKey = builder.Configuration.GetValue ("SyncfusionLicense"); Syncfusion.Licensing.SyncfusionLicenseProvider.RegisterLicense(licenseKey); Use code with caution. Frequently Asked Questions
When to Contact Vendor Support If the preceding steps fail, contact Syncfusion support with:
For cross-platform mobile apps, register the key in the main entry point of the shared project to apply it to all target platforms (iOS, Android, Windows). : Syncfusion moved to a several years ago
Open MauiProgram.cs (or App.xaml.cs for Xamarin) and register the provider inside the creation pipeline:
using Syncfusion.Licensing; var builder = WebApplication.CreateBuilder(args); // Register Syncfusion License SyncfusionLicenseProvider.RegisterLicense("YOUR_GENERATED_LICENSE_KEY_HERE"); var app = builder.Build(); Use code with caution. For .NET MAUI / Xamarin.Forms
Manually delete the bin and obj folders in your project directory. How to Fix Syncfusion Trial License Key Errors:
// Register Syncfusion license Syncfusion.Licensing.SyncfusionLicenseProvider.RegisterLicense("YOUR_ACTUAL_LICENSE_KEY_HERE"); Use code with caution. JavaScript / TypeScript (React, Angular, Vue) Place this code in your index.js , main.ts , or App.js : javascript
// Inside App.xaml.cs for WPF protected override void OnStartup(StartupEventArgs e) Syncfusion.Licensing.SyncfusionLicenseProvider.RegisterLicense("YOUR_TRIAL_KEY_HERE"); base.OnStartup(e); Use code with caution. JavaScript / Angular / React / Vue
: If an error persists after updating your key, delete the bin and obj folders and rebuild the project. For web projects, delete node_modules and the package-lock.json file, then run npm install .
using Microsoft.AspNetCore.Components.Web; // ... other imports var builder = WebApplication.CreateBuilder(args); // Register your Syncfusion license key here Syncfusion.Licensing.SyncfusionLicenseProvider.RegisterLicense("YOUR_ACTUAL_LICENSE_KEY_HERE"); var app = builder.Build(); Use code with caution.
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