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


i don't know reason behind this. in block of code.

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

the error on part. states error: no resource identifier found attribute 'layout_alignstart' in package 'android' .

this error disappear again appears. big problem because can't generate r.java because of error on part in res. tried commenting out able generate r.java. , when try run application, take time , prompts error encountered. project existing source imported/ added new project existing source.

please replace layout_alignstart layout_alignleft. have same effect on view.


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