DevForce 5.2.7 and DevExpress v10.2

I have build problem when i put DevForce 5.2.7 and DevExpress v10.2 together.

Cannot implicitly convert type 'DevExpress.XtraGrid.Views.Grid.GridView []' to 'DevExpress.XtraGrid.Views.Grid.GridView [c:\Program Files (x86)\DevExpress 2010.2\Components\Sources\DevExpress.DLL\DevExpress.XtraGrid.v10.2.dll]'

Some notes:
- Binding redirector reports that there's no version confict.
- I tried to manually change the machine.config with something like the following, build fails with the same error message too.
   <dependentAssembly>
     <assemblyIdentity name="DevExpress.Data.v10.2" publicKeyToken="B88D1754D700E49A" />
     <bindingRedirect oldVersion="10.1.0.0-10.2.6.0" newVersion="10.2.6.0" />
   </dependentAssembly>
   <dependentAssembly>
     <assemblyIdentity name="DevExpress.Utils.v10.2" publicKeyToken="B88D1754D700E49A" />
     <bindingRedirect oldVersion="10.1.0.0-10.2.6.0" newVersion="10.2.6.0" />
   </dependentAssembly>
   <dependentAssembly>
     <assemblyIdentity name="DevExpress.XtraEditors.v10.2" publicKeyToken="B88D1754D700E49A" />
     <bindingRedirect oldVersion="10.1.0.0-10.2.6.0" newVersion="10.2.6.0" />
   </dependentAssembly>
   <dependentAssembly>
     <assemblyIdentity name="DevExpress.XtraGrid.v10.2" publicKeyToken="B88D1754D700E49A" />
     <bindingRedirect oldVersion="10.1.0.0-10.2.6.0" newVersion="10.2.6.0" />
   </dependentAssembly>

Hi Kim,
Here is my scenario:
1. We were fine with DevForce v.5.2.6 and DevExpress v.9.1.3.0 Things work perfectly here.
2. Few days ago, we updated to DevExpress v.10.2.6.0, and I use project converter from DevExpress to upgrade the project.
(Note that I did not uninstall DevExpress v.9.1, in other words I have both DevExpress 9 and 10 installed on the same machine)
3. After project upgraded to use DevExpress v.10.2.6.0, I get the build failure "Cannot implicitly convert ...."
4. So I downloaded DevForce universal v.5.2.7, the release notes mention that it support DevExpress v.10.1, I think it's fine to upgrade. I uninstalled 5.2.6 and installed 5.2.7.
5. I executed "Binding Redirector", it detects version conflict of DevExpress 9.1.2 and 9.1.3.
6. I decided to uninstall DevExpress 9.1.3.
7. I executed "Binding Redirector", it says "No Version Conflict". I found it weird, so I did "manual" binding redirection as in my first post.
8. Now I'm here replying this post, still can't build the project with the error "Cannot implicitly convert ...."

You were mentioning DF2010 Winforms 4.0.2. We are using DFUniversal 5.2.7, i guess this is DF2009, right?
Hope you understand the issue better with the scenario described.
Thanks.