I have similar problem to Android Failed to install HelloWorld.apk on device (null) Error ,but I cannot start my app only on real device. On emulator all is OK. Maybe someone faced with this problem and found a good solution. Thanks in advance.
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plz check android:targetSdkVersion="__" in your menifest file.. – Niranj Patel Sep 22 '11 at 07:35
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is your device configured to allow USB debugging? – Thunder Rabbit Sep 22 '11 at 07:37
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disconnect device and connect again it may work but restart your system and do install it will work . – Uday Sep 22 '11 at 07:43
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1) With targetSdkVersion all is OK 2) With USB debugging all is OK 3) Tried several times. All worked fine a several days ago, but today I am getting such error. – drifter Sep 22 '11 at 08:23
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I noticed that although eclipse shows this error and application not starts in foreground app is being installed. Very strange. – drifter Sep 22 '11 at 08:48
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Go to Settings > Applications> Development
and uncheck "USB Debugging". Now check it again. This should solve your problem.

Guy
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Oh...my device not appearing in the devices tab after doing that :( – Narendra Singh Jun 12 '15 at 14:08