Error in indicator import

[Lopat]

Hello everyone, i want to import the following indicator: https://ninjatraderecosystem.com/use...ad/dvaluearea/

Unfortunately I always get the following message in the attachment.

Thanks
Robin

[NinjaTrader_Jason]

Hello Robin,

The error indicates you have an indicator or strategy in NinjaTrader that uses the same method names as the NinjaScript file you try to import. Do you have any other indicators or strategies installed that are similar? Unfortunately I cannot tell what other indicator or strategy contains the duplicate method names. If you have an older version of this NinjaScript already installed, please uninstall the old version first and then check if you can import it.

You can delete indicators and strategies at Control Center-->New-->NinjaScript Editor.

When I test the .zip file on my end, it imports successful.