# Problem when generating a dataset **URL:** \ **Category:** 🤝 Community Help\ **Created:** [April 17, 2023, 1:37pm UTC](https://discuss.roboflow.com/t/problem-when-generating-a-dataset/1936 "2023-04-17T13:37:24Z")\ **Posts on this page:** 12\ **Page:** 1
**Author:** ![Alberto](https://yyz1.discourse-cdn.com/flex029/user_avatar/discuss.roboflow.com/alberto/32/1689_2.png) [@Alberto](https://discuss.roboflow.com/u/Alberto)\ **Post date:** [April 17, 2023, 1:37pm UTC](https://discuss.roboflow.com/t/problem-when-generating-a-dataset/1936/1 "2023-04-17T13:37:24Z")
Hello, I have a problem when generating a dataset from my labelled images. I follow the steps, although after the proccess finishes, the page says: 1277 images (what it should have), Nevertheless, when I click on “view all images”, it says " This version is empty. Upload or select images and annotations from your library to continue.". And when I download the dataset, only two .txt are in the .zip file, no image at all (not even the folder stucture of YOLO). I found similar problems: [Generating new dataset version leave images empty - Community Help - Roboflow](https://discuss.roboflow.com/t/generating-new-dataset-version-leave-images-empty/1572) [Can not export dataset - Community Help - Roboflow](https://discuss.roboflow.com/t/can-not-export-dataset/250/14) But I couldn’t fix it following those answers. Is there any problem currently? Could anyone help me with it? Thank you in advance. Best regards, Alberto. ---
**Author:** ![Alberto](https://yyz1.discourse-cdn.com/flex029/user_avatar/discuss.roboflow.com/alberto/32/1689_2.png) [@Alberto](https://discuss.roboflow.com/u/Alberto)\ **Post date:** [April 17, 2023, 2:17pm UTC](https://discuss.roboflow.com/t/problem-when-generating-a-dataset/1936/2 "2023-04-17T14:17:56Z")
Here is the dataset, just in case you need it to check what’s wrong: [deteccion - v16 2023-04-17 3:25pm (roboflow.com)](https://universe.roboflow.com/solardrone/deteccion-ndurf/dataset/16) ---
**Author:** ![Juraj\_Budai](https://yyz1.discourse-cdn.com/flex029/user_avatar/discuss.roboflow.com/juraj_budai/32/1313_2.png) [@Juraj\_Budai](https://discuss.roboflow.com/u/Juraj_Budai)\ **Post date:** [April 17, 2023, 4:05pm UTC](https://discuss.roboflow.com/t/problem-when-generating-a-dataset/1936/3 "2023-04-17T16:05:47Z")
Hey, Alberto. I have had same issue and in my case it was caused by "" character in class name. I have had to change the class name manually and after that it is working correctly. ---
**Author:** ![Alberto](https://yyz1.discourse-cdn.com/flex029/user_avatar/discuss.roboflow.com/alberto/32/1689_2.png) [@Alberto](https://discuss.roboflow.com/u/Alberto)\ **Post date:** [April 17, 2023, 4:36pm UTC](https://discuss.roboflow.com/t/problem-when-generating-a-dataset/1936/4 "2023-04-17T16:36:48Z")
Thank you Juraj! Actually, I change the name of a class in the step 3 (preprocessing), because it has a “/” character, but it still happens… So I don’t know what’s wrong… ---
**Author:** ![Juraj\_Budai](https://yyz1.discourse-cdn.com/flex029/user_avatar/discuss.roboflow.com/juraj_budai/32/1313_2.png) [@Juraj\_Budai](https://discuss.roboflow.com/u/Juraj_Budai)\ **Post date:** [April 17, 2023, 5:12pm UTC](https://discuss.roboflow.com/t/problem-when-generating-a-dataset/1936/5 "2023-04-17T17:12:21Z")
I had to change every class containing “/” this character in dataset, remapping didnt help me. ---
**Author:** ![Alberto](https://yyz1.discourse-cdn.com/flex029/user_avatar/discuss.roboflow.com/alberto/32/1689_2.png) [@Alberto](https://discuss.roboflow.com/u/Alberto)\ **Post date:** [April 17, 2023, 5:14pm UTC](https://discuss.roboflow.com/t/problem-when-generating-a-dataset/1936/6 "2023-04-17T17:14:20Z")
Thank you. The only option I see is the preprocessing step. Is there any other way to change the name of the classes? Thank you in advance ---
**Author:** ![Juraj\_Budai](https://yyz1.discourse-cdn.com/flex029/user_avatar/discuss.roboflow.com/juraj_budai/32/1313_2.png) [@Juraj\_Budai](https://discuss.roboflow.com/u/Juraj_Budai)\ **Post date:** [April 17, 2023, 5:17pm UTC](https://discuss.roboflow.com/t/problem-when-generating-a-dataset/1936/7 "2023-04-17T17:17:08Z")
I dont know about any other option than do it manually. ---
**Author:** ![Alberto](https://yyz1.discourse-cdn.com/flex029/user_avatar/discuss.roboflow.com/alberto/32/1689_2.png) [@Alberto](https://discuss.roboflow.com/u/Alberto)\ **Post date:** [April 17, 2023, 10:38pm UTC](https://discuss.roboflow.com/t/problem-when-generating-a-dataset/1936/8 "2023-04-17T22:38:10Z")
Thank you Juraj, I am trying it. I could do the ones which could be changed manually (wrong label), but there are unused labels (indeed, the one with the character // is an unused label) and I cannot remove it… Do you have any idea on how to do it? ---
**Author:** ![Mohamed](https://yyz1.discourse-cdn.com/flex029/user_avatar/discuss.roboflow.com/mohamed/32/62_2.png) [@Mohamed](https://discuss.roboflow.com/u/Mohamed)\ **Post date:** [April 19, 2023, 5:55am UTC](https://discuss.roboflow.com/t/problem-when-generating-a-dataset/1936/9 "2023-04-19T05:55:38Z")
@Alberto, if there is an unused label, try clicking “Regenerate” on Health Check to see if it appears, still. ![image](https://canada1.discourse-cdn.com/flex029/uploads/roboflow1/original/2X/9/9c7fb7aba9f7d90a32ce5b491ade970fb249c552.png) After all of the “problem” labels are removed, then delete the affected versions, and regenerate your dataset. ---
**Author:** ![Alberto](https://yyz1.discourse-cdn.com/flex029/user_avatar/discuss.roboflow.com/alberto/32/1689_2.png) [@Alberto](https://discuss.roboflow.com/u/Alberto)\ **Post date:** [April 19, 2023, 6:15am UTC](https://discuss.roboflow.com/t/problem-when-generating-a-dataset/1936/10 "2023-04-19T06:15:32Z")
@Mohamed Thank you so much! I tried to regenerate. Indeed, some unused classes have disappeared. Nevertheless, the one which apparently creates the problem (//) still appears. It says it has 22 annotations. But when I click on it and search for the images which have that class, there is no result at all (when I click on another class, it returns to me the images). So, in summary, there are 22 annotations with // but no image appears, therefore I cannot change/remove the label… Could you please guide me to solve it? Thank you so much again! ---
**Author:** ![TimmyJordan](https://avatars.discourse-cdn.com/v4/letter/t/848f3c/32.png) [@TimmyJordan](https://discuss.roboflow.com/u/TimmyJordan)\ **Post date:** [April 21, 2023, 1:28pm UTC](https://discuss.roboflow.com/t/problem-when-generating-a-dataset/1936/11 "2023-04-21T13:28:57Z")
I would recommend reaching out to Roboflow’s customer support team for assistance. They will be able to provide you with more personalized and specific help for the issue you’re experiencing. You can contact them through their support page or by emailing [support@roboflow.com](mailto:support@roboflow.com). In the meantime, you might also try generating the dataset again using a different method or platform to see if the issue persists. There are many other data labeling and dataset generation tools available online that you can try out. ---
**Author:** ![Mohamed](https://yyz1.discourse-cdn.com/flex029/user_avatar/discuss.roboflow.com/mohamed/32/62_2.png) [@Mohamed](https://discuss.roboflow.com/u/Mohamed)\ **Post date:** [April 22, 2023, 10:06pm UTC](https://discuss.roboflow.com/t/problem-when-generating-a-dataset/1936/12 "2023-04-22T22:06:04Z")
If @Alberto can file a bug report here, actually, that will help us get it resolved: [GitHub - roboflow/external-bugtracker](https://github.com/roboflow/external-bugtracker) We have a guide for bug reports here as well: [How to File a Bug Report - Roboflow](https://help.roboflow.com/how-to-file-a-bug-report) And for others that see this, our main support email is ![image](https://canada1.discourse-cdn.com/flex029/uploads/roboflow1/original/2X/c/c714da6f3bb60266fc708242b32f2a49b8222b7d.png)