Welcome to the community! Looking at your error message, i guess, you have used a wrong question type (cascading_select) that is not supported by KoBoToolbox. Try finding it and replacing it with an appropriate question type (select_one or select_multiple).
It’s sometimes helpful to validate your xlsform through this online validator. It should help you identify the syntax errors if present within your xlsform.
Hi @stephanealoo. Thank you for your interest. I don´t think that could be the syntax of the XLSForm becasue when this happened, I tried to upload again and worked perfectly.
Thank you @Kal_Lam for your response and your interest, I don´t think that could be the syntax of the XLSForm becasue when this happened, I tried to upload again and it worked perfectly.
@segadu78, thank you. We shall create a GitHub issue if we are able to reproduce it in the future. Thank you once again for bringing this to the community. We shall be keeping a close eye for this issue.
Welcome to the community, @ladislas! Maybe you will need to check your question type where you have used Text instead of text. Hope this solves your issue.