gradle project sync failed . android studio -

i'm new android , have problem in picture :

i tired update constraint layout , constraint layout solver each time try update in sdk manager update finish when @ sdk manager again it's unchecked . example after downloading constraint layout , constraint layout solver :

but when @ android sdk path in finder there 4 version of constraint layout installed : 1.0.0alpha7
1.0.0alpha2
1.0.1
1.0.2

i downloaded gradle 2.14 , copy , replace unzipped file default gradle 3.3 installed android studio ... no change !

can plz . spend 5 hours on , nothing changed

as indicated in error message, problem appcompat support library, not constraintlayout library. specify particular version or add * after major version code, so:

compile 'com.android.support:appcompat-v7:25.3.1'

or

compile 'com.android.support:appcompat-v7:25.*'