eclipse - error: No resource identifier found for attribute 'layout_alignStart' in package 'android' -


i have project imported source , there problems showing. 1 of layouts, says "error: no resource identifier found attribute 'layout_alignstart' in package 'android'" at:

<progressbar         style="@android:style/widget.progressbar.small"         android:layout_gravity="center_vertical"         android:layout_alignstart="@id/imageframe"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:indeterminate="true"         android:id="@+id/progressbar"         android:layout_alignparenttop="true"         android:layout_margintop="15dp"     />

where imageframe id of framelayout.

my project build target api level 17 , in manifest:

    <uses-sdk     android:minsdkversion="11"     android:targetsdkversion="11" />

in menu xml file:

    <item     android:id="@+id/menu_settings"     android:orderincategory="100"     android:showasaction="never"     android:title="@string/menu_settings"/>

and note not literally "imported" added through "android project existing code" i'm using eclipse project.

@+id/imageframe can try 1 hope work now


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