getting error for relation table data extract - Invalid where clause

BackendlessUser currentUser = Backendless.UserService.CurrentUser();
BackendlessDataQuery dataQuery = new BackendlessDataQuery();
dataQuery.setWhereClause( “email.ObjectId=”+currentUser.getObjectId());
Backendless.Data.of( Maintenance.class ).find( dataQuery, new AsyncCallback<BackendlessCollection<Maintenance>>()
{
@Override
public void handleResponse( BackendlessCollection<Maintenance> maint )
{
}

Its a relation column but still i am getting error as Server reported an error - Invalid where clause
Kindly help

table details
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</img>

Since objectId is a string, it must be surrounded by quotes:

dataQuery.setWhereClause( “email.objectId=’”+currentUser.getObjectId() + “’”);

Also notice it is email.objectId, not email.ObjectId