Warning BE0001: Unable to determine presentation style from folder '[folder]'. Assuming Prototype style.
Cause
The build engine was unable to determine which presentation style is in used based on the selected PresentationStyle property value.
Solution
Sandcastle comes with three default presentation styles: Prototype, Hana, and VS2005. These are located in the %DXROOT%\Presentation folder. You can create additional styles by adding other folders with modified or brand new styles in that location. However, the names of the additional style folders must contain the name of one of the other base styles. The name is case-insensitive and can appear anywhere within the folder name. This is required as certain parts of the Sandcastle build process differ based on the selected presentation style. The base name gives the build process a hint as to how it should handle those parts.
If the folder name does not contain one of the base style names, this warning is issued. To fix the problem, rename the folder so that it does contain one of the base style names.