将项目添加为引用会导致无法加载文件或程序集或其依赖项之一

我在Visual Studio 2012中有一个包含多个项目的解决方案。我正在尝试将一个项目作为参考添加到另一个项目中，以便能够将它们一起使用，但我无法弄清楚为什么添加此项目引用会导致在部署/运行时丢失 DLL（FusionLog下文）。我以前使用过这种方法而没有这个问题，所以我一定在这里错过了一些东西......

解决方案配置：

主项目： Bootstrapper
子项目：BootstrapperCustom
我正在尝试添加的项目作为参考：LicenseCheck BootstrapperCustom
部署时缺少 DLL：LicenseCheck.dll

[Bootstrapper]
--Installer: Configuration: N/A, Platform: N/A
--Build: Configuration: Active (Debug), Platform: Active (x86)
--Ref:
----[BootstrapperCustom]
[BootstrapperCustom]
--Application: Configuration: N/A, Platform: N/A, Target framework: .NET 4.5, Output type: Class library
--Build: Configuration: Active (Debug), Platform: Active (Any CPU), Platform target: Any CPU
--Ref:
----[BootstrapperCore] (Copy Local: True)
----[LicenseCheck] (Copy Local: True)
----[Microsoft.Deployment.WindowsInstaller] (Copy Local: True)
----[Microsoft.Practices.Prism] (Copy Local: True)
[LicenseCheck]
--Application: Configuration: N/A, Platform: N/A, Target framework: .NET 4.5, Output type: Class library
--Build: Configuration: Active (Debug), Platform: Active (x86), Platform target: Any CPU
--Ref:
----[Microsoft.Deployment.WindowsInstaller] (Copy Local: True)
----[Parse] (Copy Local: True)

错误信息：

Run Bootstrapper.exe = `Could not load file or assembly 'LicenseCheck, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.`

FusionLog （已确认的许可证检查.dll缺失）：

[%TEMP%'{x}'.ba1]
--BootstrapperCore.dll
--BootstrapperCustom.dll
--Microsoft.Practices.Prism.dll
=== Pre-bind state information ===
LOG: User = NOTTHOR'dirt
LOG: DisplayName = LicenseCheck, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
 (Fully-specified)
LOG: Appbase = file:///C:/Users/dirt/AppData/Local/Temp/{94ef2c32-a419-410e-a8a0-df404f022ff7}/.ba1/
LOG: Initial PrivatePath = NULL
Calling assembly : BootstrapperCustom, Version=1.0.5028.16514, Culture=neutral, PublicKeyToken=null.
===
LOG: This bind starts in default load context.
LOG: Using application configuration file: C:'Users'dirt'AppData'Local'Temp'{94ef2c32-a419-410e-a8a0-df404f022ff7}'.ba1'BootstrapperCore.config
LOG: Using host configuration file: C:'Users'dirt'AppData'Local'Temp'{94ef2c32-a419-410e-a8a0-df404f022ff7}'.ba1'BootstrapperCore.config
LOG: Using machine configuration file from C:'Windows'Microsoft.NET'Framework'v4.0.30319'config'machine.config.
LOG: Policy not being applied to reference at this time (private, custom, partial, or location-based assembly bind).
LOG: Attempting download of new URL file:///C:/Users/dirt/AppData/Local/Temp/{94ef2c32-a419-410e-a8a0-df404f022ff7}/.ba1/LicenseCheck.DLL.
LOG: Attempting download of new URL file:///C:/Users/dirt/AppData/Local/Temp/{94ef2c32-a419-410e-a8a0-df404f022ff7}/.ba1/LicenseCheck/LicenseCheck.DLL.
LOG: Attempting download of new URL file:///C:/Users/dirt/AppData/Local/Temp/{94ef2c32-a419-410e-a8a0-df404f022ff7}/.ba1/LicenseCheck.EXE.
LOG: Attempting download of new URL file:///C:/Users/dirt/AppData/Local/Temp/{94ef2c32-a419-410e-a8a0-df404f022ff7}/.ba1/LicenseCheck/LicenseCheck.EXE.

注意：当我重新构建BootstrapperCustom项目时，我确实看到 LicenseCheck.dll 在 Bootstrapper'bin'Debug 中生成。