Issue updating from version 8.4.2 -> 9.0.1 Piranha.Models.RegionType missing error

[hedronn]

I have attempted to update to version 9.0.1 from version 8.4.2 and and encountered the following error - JsonSerializationException: Could not find type 'Piranha.Models.RegionType' in assembly 'Piranha, Version=9.0.1.0, Culture=neutral, PublicKeyToken=null'

Newtonsoft.Json.JsonSerializationException: 'Error resolving type specified in JSON 'System.Collections.Generic.List`1[[Piranha.Models.RegionType, Piranha]], System.Private.CoreLib'. Path '$values[0].Regions.$type', line 1, position 676.'

Is this a .NET 5 serializing issue with NewtonSoft vs System.Text.Json serializer perhaps?...has anyone else experienced this issue upgrading from 8x to 9x?

[hedronn]

Ok so on further investigation is appears that the class RegionType has been dropped from piranha.model in v9

[Serializable]
public sealed class RegionType (from v8.4.2)

So i expect my v8.4.2 project has some old reference to this class after upgrading to v9.0.1

I will update once i know more, to help anyone else experiencing this issue.

[hedronn]

I have not been able to identify any old references to version 8x in respect to Piranha.Models.RegionType so currently at a bit of a loss as to how to proceed with this error.

Can anyone help with this upgrade issue i am experiencing?

[hedronn]

This issue was as a result of a cached object once removed the error was cleared, additional issue was the need to alter the way Piranha is setup in the Startup.cs for version 9x - refer to this documentation for help

https://piranhacms.org/docs/master/basics/application-setup
https://piranhacms.org/docs/master/basics/startup-options