Itext Library nto working

[TidelxD]

I implement the library the same as you did , implementation 'com.itextpdf:itext7-core:7.1.12' ,
but when i import it it shows no resolved !

then i changed the method of implementation i used to libraries :
implementation 'com.itextpdf.android:kernel-android:7.2.2'
implementation 'com.itextpdf.android:layout-android:7.2.2'

it work normmaly but when i used the TextAlignment or UnitValue it shows not acceptable from
com.itextpdf.layout.properties.TextAlignment , but com.itextpdf.layout.property.TextAlignment excepted

i didn't find were the problem is