i think you need the 4.2 SDK for .9.1 maybe? also make sure you are building to a device and under the right OS version.
also, try this, I found it on google:
fixed this problem by doing two things. First. choose Project --> Edit PRoject Settings. When a dialog appears, click the Build tab and change the value in the Base SDK option.
Second, choose Project --> Edit Active Target. When a dialog appears, click the Build tab and change the Base SDK option again.
In both cases, I changed it to iPhone 4.0 and rebuilt the project and it worked.
Comments
also make sure you are building to a device and under the right OS version.
also, try this, I found it on google:
fixed this problem by doing two things. First. choose Project --> Edit PRoject Settings. When a dialog appears, click the Build tab and change the value in the Base SDK option.
Second, choose Project --> Edit Active Target. When a dialog appears, click the Build tab and change the Base SDK option again.
In both cases, I changed it to iPhone 4.0 and rebuilt the project and it worked.
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