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When I added a tooltip to dropdown, I get a message asking me to authenticate my license.


After updating the package to version 21.1.35, the license key is not authenticated.

The platforms selected are asp.net core, asp.net mvc, blazor, and javascript.

I added the source code below and you are prompted to authenticate the license.

var tooltip = new ej.popups.Tooltip(
                            // default content of tooltip
                            content: 'Loading...',
                            // set target element to tooltip
                            target: '.e-custom-class .e-list-item',
                            // set position of tooltip
                            position: 'RightCenter',
                            // bind beforeRender event
                            beforeRender: onBeforeRender

                        function onBeforeRender(args) {
                            // get the target element
                            var dropdown = document.getElementById('DropdownProject').ej2_instances[0];
                            for (var i = 0; i < dropdown.listData.length; i++) {
                                if (dropdown.listData[i].value === args.target.textContent) {
                                    this.content = dropdown.listData[i].value;

5 Replies

JM Jeyaseelan M Syncfusion Team March 28, 2023 07:08 AM UTC

Hi Taewook,

We suspect that still Syncfusion old licensing assemblies are being referred in your project. Could you please try cleaning your project, clear the NuGet cache, deleting the bin\obj folders and rebuild your application, then check whether it resolves the issue.

If you are updating to version v21.1.35, please update the license key for the same version in your application. Please, ensure that all the referenced Syncfusion assemblies\NuGet packages are all on the same version as license key’s version in your project.

Syncfusion license keys are version and platform-specific and the generated license key is just a string that needs to be registered before any Syncfusion control is initiated.

To know about generating the license key,


To know about registering the license key,


Refer the below knowledge base article for more information,


If the reported issue is still not resolved,  please share with us the following details to check issue from our side, 

  1. List of Syncfusion NuGet packages\assemblies used and its version,

  1. Screenshot of license key registered place in your application

  1. Screenshot of issue you’re facing.


Jeyaseelan M

TK TaeWook Kang March 29, 2023 11:18 PM UTC

작성자: Jeyaselan,

말씀하신대로 버전과 플랫폼을 확인하고 재구축했는데도 같은 현상이 발생합니다.

In addition, if you add the attached source code, regardless of the version, a license authentication message is displayed.


JM Jeyaseelan M Syncfusion Team March 30, 2023 12:57 PM UTC

Taewook, we have requested the details in order to investigate the issue further from our side. Please follow up on the ticket under your account.

TK TaeWook Kang April 2, 2023 11:06 PM UTC

제야 셀란,

I've raised a ticket for the project causing the error and a screenshot. Please check.

GE Getsy Edwin Syncfusion Team April 3, 2023 01:47 PM UTC

Taewook, please follow the ticket for further updates which you have created

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