Brevo (sendinblue) plugin error message

Unfortunately, there’s been an error, feel free to reach our support team. Error calling CreateAttribute: {"code":"invalid_parameter","message":"Incorrect formula. Please refer https://help.brevo.com/hc/en-us/articles/209558545-Use-formulas to read the formula"}

Is this an important message or just a notification?

I am also seeing the same notification while saving configuration Sendinblue settings.

Is there also an error message in the System Log?  If so, post entire message here (including the stack trace)

sib_api_v3_sdk.Client.ApiException: Error calling CreateAttribute: {"code":"invalid_parameter","message":"Incorrect formula. Please refer https://help.brevo.com/hc/en-us/articles/209558545-Use-formulas to read the formula"}
   at sib_api_v3_sdk.Api.AttributesApi.CreateAttributeAsyncWithHttpInfo(String attributeCategory, String attributeName, CreateAttribute createAttribute)
   at sib_api_v3_sdk.Api.AttributesApi.CreateAttributeAsync(String attributeCategory, String attributeName, CreateAttribute createAttribute)
   at Nop.Plugin.Misc.Sendinblue.Services.SendinblueManager.CreateAttibutesAsync(IList`1 attributes)

You will probably find a solution in this forum thread. Let me know if this is something else.

I was using Nop4.4 and fixed the plugin by following the instructions in post.
Thank you.