Database synchronization failed. You may have to do a full build of the package ApplicationSuite and all of its dependent packages. D365 Error

D365 synchronization Failed  Database synchronization failed. You may have to do a full build of the package ApplicationSuite and all of its dependent packages. 

There can be multiple reasons for the database synchronization failure.

1) While doing a full build if you get the sync failure then check the error messages .If you have got any error as below.

"The CREATE UNIQUE INDEX statement terminated because a duplicate key"

then this is a purely data related issue you will have to fix the data and then sync again.

2) If you get errors during Data Entity synchronization then it might be a case that you have duplicated or used the same label for an entity which is being used.

Solution : Change the label of the Entity or table.

3) In case of below error .

SqlException:Execution Timeout Expired. 

Solution : Try to do it again after restarting .

Or else you will have to check the resources being utilized and use it to best .

Thanks,

Vikas Mehta.