can anyone tell me how to fix this error vcn520 error code 119108006?

Is the system reporting an error when you perform the delete device operation?

Here is a handling suggestion, please refer to

If the fault persists, provide VCN520 operation logs and contact Huawei technical support.

Hell friend! hope it can help:
Changing the IP address of the primary node will bring the secondary node offline. Therefore, devices on the secondary node cannot be deleted. To rectify the fault, log in to the configuration web page of the OMU portal and change the IP address of the secondary node. The operation procedure is as follows:
1. Log in to the OMU portal as the Admin user.
2. Choose Local Configuration > Basic Configuration.
3. Click Edit.
4. Switch the secondary node deployment mode to Single-node and click Save.
5. Switch the server deployment mode to the Standby node and set the Upper-level IP address to the new IP address of the primary node.
6. Click Save.

https://support.huawei.com/enterprisesearch/ebgSearch?newPbi=3#type=searchAll&lang=en&keyword=119108006&productPath=1482615596259|1560492598859|21818015

Thanks!