Excel Labs : Grid editor open and stay blank

Hi Nicolino and SergeiBaklan,

Thanks for the analyse.

I joined the debbuger as suggested in the menu functions and it shows these messages in loop in the consol tab :

taskpane.2c4b4cd292f…b3f683e.bundle.js:2 External code service environment data read failed:
 RichApi.Error: Nous n’avons pas pu trouver l’API que vous essayez d’utiliser. Elle peut être disponible dans une version plus récente d’Excel. Veuillez vous référer à la documentation : « https://docs.microsoft.com/office/dev/add-ins/reference/requirement-sets/excel-api-requirement-sets ».
 at new n (excel-win32-16.01.js:26:273020)
 at i.processRequestExecutorResponseMessage (excel-win32-16.01.js:26:338426)
 at excel-win32-16.01.js:26:336486
 at async taskpane.2c4b4cd292f…bundle.js:2:8008233
 at async taskpane.2c4b4cd292f…bundle.js:2:8008104
 at async t.CoalescingJobQueue.onRun (taskpane.2c4b4cd292f…bundle.js:2:8008041)

taskpane.2c4b4cd292f…b3f683e.bundle.js:2 Error reading cell data (sheetId={8F5197BB-09D7-4AC6-9739-AB80D4CF0C29}, values=M13:O15, formulas=M13:O15, blanks=M13:O15):
 RichApi.Error: La propriété « valuesAsJson » n’est pas disponible. Avant de lire la valeur de la propriété, appelez la méthode de chargement sur l’objet conteneur et appelez « context.sync() » sur le contexte de demande associé.
 at new n (excel-win32-16.01.js:26:273020)
 at n.createPropertyNotLoadedException (excel-win32-16.01.js:26:376486)
 at n.throwIfNotLoaded (excel-win32-16.01.js:26:376229)
 at r.get [as valuesAsJson] (excel-win32-16.01.js:26:386878)
 at taskpane.2c4b4cd292f…bundle.js:2:7997401
 at E (taskpane.2c4b4cd292f…bundle.js:2:7997799)
 at taskpane.2c4b4cd292f…bundle.js:2:8003900
 at async t.CoalescingJobQueue.onRun (taskpane.2c4b4cd292f…bundle.js:2:7999438)

It seems indicating to me that an Excel API fonction is missing !

I guess that's Excel 2021. If so Excel Labs shall work with it. At least AFE, not sure about other components. If right pane is blank that could be issue with internet connection (settings, firewall). Also clean of Office cache could help. Or simple restart.

Based on the version details you provided (Excel LTSC 16.0.14334.20688), it is highly likely that you are facing an incompatibility issue with the Grid Editor, but it is difficult to claim this with 100% certainty without official documentation from Microsoft.