I can't install .net Compact Framework 3.5

Could anyone help me ?

It says "installation error. stop all applications and processes, maximize available storage space, and run installation again. Support info: 3"

I sure I have space to install it. (other apps. can install)
and I closed all running apps.

Help me plz

My device
HP rw6828
Rom wm6.1 by NHOCBANME

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