Changing SDK version and rebuilding iOS project for simulator or device causes error during build.

Description:
When a new SDK is selected in Studio, and the project is saved and a run is attempted, and error will occur:
[ERROR] Error: Traceback (most recent call last):
File "/Library/Application Support/Titanium/mobilesdk/osx/1.8.03360/iphone/builder.py", line 1162, in main
execute_xcode("iphonesimulator%s" % link_version,["GCC_PREPROCESSOR_DEFINITIONS=__LOG__ID__=%s DEPLOYTYPE=development TI_DEVELOPMENT=1 DEBUG=1 TI_VERSION=%s %s" % (log_id,sdk_version,debugstr)],False)
File "/Library/Application Support/Titanium/mobilesdk/osx/1.8.03360/iphone/builder.py", line 1080, in execute_xcode
output = run.run(args,False,False,o)
File "/Library/Application Support/Titanium/mobilesdk/osx/1.8.03360/iphone/run.py", line 39, in run
sys.exit(rc)
SystemExit: 65

Steps to reproduce:
1) Launch studio
2) Create a new mobile project with iOS targets
3) Run project in simulator or on device
4) Choose a new SDK and save Tiapp.xml
5) Attempt to run on device or in the simulator

Result:
Failure with an error as listed above

Expected result:
THe build completes and runs as expected.

Notes:
The workaround is to clean the project and run again. It will be successful.