Load of property 'OutputPath' failed. the entered path is not a valid output path

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C#

VS2010

BUILD

properties

Hi,

I ve got the following problem:

Within my csproj I use a variable, I ve declared in an external properties file. To reference it, I ve imported this properties file.

properties file:

<?xml version="1.0" encoding="utf-8" ?>
<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
	<PropertyGroup>
		<!-- Reference Paths -->
		<REFERENCE_PATH_bla Condition="'$(REFERENCE_PATH_bla)' == ''">$(bla_HOME)</REFERENCE_PATH_bla>
		<TC_REFERENCE_PATH_bla>$(REFERENCE_PATH_bla)\bla</TC_REFERENCE_PATH_bla>
		<DLL_INTEROPS_REFERENCE_PATH_bla>$(REFERENCE_PATH_bla)\dll\Interops</DLL_INTEROPS_REFERENCE_PATH_bla>
		<COMMONLIBS_REFERENCE_PATH_bla>$(REFERENCE_PATH_bla)\libs</COMMONLIBS_REFERENCE_PATH_bla>
	</PropertyGroup>

	<PropertyGroup>
		<!-- Build Ouput Paths -->
		<BUILD_OUTPUTPATH_bla Condition="'$(BUILD_OUTPUTPATH_bla)' == ''">$(SolutionDir)..\..\Build\AutomationBuild</BUILD_OUTPUTPATH_bla>
		<BUILD_OUTPUTPATH_bla>$(BUILD_OUTPUTPATH_bla)\Automation</BUILD_OUTPUTPATH_bla>
		<BUILD_OUTPUTPATH_bla_ADDINS>$(BUILD_OUTPUTPATH_bla)\bla\AddIns</BUILD_OUTPUTPATH_bla_ADDINS>
	</PropertyGroup>
</Project>

csproj:

<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <Import Project="$(SolutionDir)..\..\Build\Properties\bla.Build.Output.Properties" />
  <PropertyGroup>
    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
    <ProductVersion>8.0.30703</ProductVersion>
    <SchemaVersion>2.0</SchemaVersion>
    <ProjectGuid>{bla}</ProjectGuid>
    <OutputType>Library</OutputType>
    <AppDesignerFolder>Properties</AppDesignerFolder>
    <RootNamespace>bla.Automation</RootNamespace>
    <AssemblyName>bla.Automation.Creation</AssemblyName>
    <TargetFrameworkVersion>v3.5</TargetFrameworkVersion>
    <FileAlignment>512</FileAlignment>
    <TargetFrameworkProfile />
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
    <DebugSymbols>true</DebugSymbols>
    <DebugType>full</DebugType>
    <Optimize>false</Optimize>
    <OutputPath>$(BUILD_OUTPUTPATH_bla)\Framework\</OutputPath>
    <DefineConstants>DEBUG;TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
(...)

Now, on Solution-startup I get a bunch of warnings that tell me:

Load of property 'OutputPath' failed. The entered path is not a valid output path.

Additionally when I try to build my solution I get:

The task cmd.exe could not be run. The entered path is not a valid output path.

I am quite sure, that this is all related to the fact, that the variable I use can not be solved. (Resharper tells me, that it is not defined.

Any idea?