Welcome @elif.duz
My initial guess is that you are running out of storage space to write the outputs.
You can check under User → Preferences → Storage Dashboard
Your default storage location is the 250 Gb of permanent disk space. However, you also have a 1 Tb allocation of temporary working space at UseGalaxy.org!
It is common to place the starting raw data into the temporary space, and to write intermediate workflow outputs there too! Then the final output data is commonly written into the permanent space since this is what you will be exploring over time.
What to do if this is true
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Move some of your data into the 1 Tb allocation. You can do this in batches or one-by-one per file. → Bulk Dataset Storage Migration
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Consider rerunning your workflow and choosing specific storage location outputs for all or parts of your workflow outputs. → Data Storage choices when using Workflows
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Learn more for setting up your default storage locations across your account, per history, and per workflow! → Navigating your data storage: existing data, new data, and different storage space options with screenshots! - #4 by jennaj
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More details can be found here. → How to access your Self Serve extended data storage at UseGalaxy servers! - #2 by jennaj
Please let us know this is the was your use case or not, and if you have any follow up questions. And if you share back your public user name (not your email, and never your password with anyone!), I can take an administrative peek at your account to confirm specific help about what to do first. 