> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ntop.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Invalid Block Error

## Invalid Block Error

### About the error

**Issue:**
The function block referenced in the nTop file was not found in this version of software.

**Applies to:**

* Blocks or types that are no longer available in the current version of software either because of a permissions mismatch or becaues of a deprecated blocks that have been retired.

**Solution:**

* Please ensure you have the correct software version and permissions to run the nTop file.
* Open the file in a prior version of the software to see if any blocks were marked with a deprecation warning. If so,please update the notebook to use the latest versions of the affected blocks before reopening in a newer version of the software.
* If the error persists, please contact nTop Support by visiting support.ntop.com with the error messages and contents in the block's Information panel.

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