Alabcore not building the project in 'Release' mode

[shine17]

here is my code -

require 'albacore'

desc "Run a simple clean and rebuild"
build :buildSln do |msb|
msb.sln = 'C:\GitRepos\shinetest\testapps\Albacorerakesample\AlbacoreRakeDotnetBuildSample\AlbacoreRakeDotnetBuildSample.sln' #Path of solution file.
msb.target = [:Clean, :Rebuild] # call with an array of targets or just a single target
msb.properties = {
:Configuration => 'Release' ,
:Platform => 'Any CPU',
:verbosity => 'detailed'
}
msb.logging = 'detailed'
msb.clp 'ShowEventId'
end

Only the debug mode dlls are created. Release mode dll are not created.
I am using dot net 4.5.1 .

Please help! Thanks in advance

[divanvisagie]

For anyone that lands here the answer lies here: https://github.com/Albacore/albacore/wiki/build

instead of using:

 b.properties = { :configuration => :Release }

Rather use:

b.prop 'Configuration', 'Release'