entity framework - Getting multiple errors during Database-Migration with EF6 and .NET 4.6.1 -

getting following errors:

"validation failed 1 or more entities. see 'entityvalidationerrors' property more details." @ line 89 of configuration.cs

line 89 context.savechanges();, @ end of class file:

namespace model.migrations {     using system;     using system.data.entity;     using system.data.entity.migrations;     using system.linq;      internal sealed class configuration : dbmigrationsconfiguration<model.applicationdbcontext>     {         public configuration()         {             automaticmigrationsenabled = false;         }          protected override void seed(applicationdbcontext context)         {             seeddata.additionalseed _additionalseed = new seeddata.additionalseed();              _additionalseed.seed_stateorprovince(context);             _additionalseed.seed_countryorregion(context);             _additionalseed.seed_contacttypes(context);             _additionalseed.seed_currencycodes(context);              _additionalseed.seed_preferences_calendarsettings_calendarview(context);             _additionalseed.seed_preferences_calendarsettings_weeklyview(context);             _additionalseed.seed_preferences_calendarsettings_whattoshow(context);             _additionalseed.seed_preferences_calendar_futurepastsettings(context);             _additionalseed.seed_preferences_itemsandinventory_advancedinventory_barcodes_copybarcodefrom(context);             _additionalseed.seed_preferences_itemsandinventory_unitofmeasuretype(context);             _additionalseed.seed_preferences_payrollemployees_employeedefaults_payfrequency(context);             _additionalseed.seed_preferences_payrollemployees_employeedefaults_sickandvacationdefaults_accuralperiod(context);             _additionalseed.seed_preferences_payrollemployees_employeedefaults_taxes_filingstatus(context);             _additionalseed.seed_preferences_reportsandgraphs_reportpreferences_datepreparedformat(context);             _additionalseed.seed_preferences_reportsandgraphs_reportpreferences_pagenumberformat(context);             _additionalseed.seed_preferences_reportsandgraphs_reportpreferences_pagelayout(context);             _additionalseed.seed_preferences_salesandcustomers_invoicepackingslip(context);             _additionalseed.seed_preferences_salesandcustomers_roundingrules(context);             _additionalseed.seed_preferences_salesandcustomers_shippers(context);             _additionalseed.seed_preferences_salestax_intervals(context);             _additionalseed.seed_preferences_salestax_salestaxcode(context);             _additionalseed.seed_preferences_sendforms_sendmethod(context);             _additionalseed.seed_preferences_sendforms_deliverymethod(context);             _additionalseed.seed_preferences_sendforms_emailtemplatecategorylist(context);             _additionalseed.seed_preferences_timeandexpenses_workweek(context);              _additionalseed.seed_security_rolemaster(context);             context.savechanges();             _additionalseed.seed_security_accountingrole(context);             _additionalseed.seed_security_bankingrole(context);             _additionalseed.seed_security_centersrole(context);             _additionalseed.seed_security_companyrole(context);             _additionalseed.seed_security_customerandreceivablesrole(context);             _additionalseed.seed_security_employeesandpayrollrole(context);             _additionalseed.seed_security_filerole(context);             _additionalseed.seed_security_listsrole(context);             _additionalseed.seed_security_reportsrole(context);             _additionalseed.seed_security_sitesettingsrole(context);             _additionalseed.seed_security_timetrackingrole(context);             _additionalseed.seed_security_vendorsandpayablesrole(context);              _additionalseed.seed_taxesfilingstatus(context);             _additionalseed.seed_employmenttype(context);             _additionalseed.seed_employeeemergencycontacttype(context);             _additionalseed.seed_employeeethnicity(context);             _additionalseed.seed_employeemaritalstatus(context);             _additionalseed.seed_salutations(context);              _additionalseed.seed_defaultunitusedfortypes(context);             _additionalseed.seed_unitofmeasuredefaulttype(context);             context.savechanges();             _additionalseed.seed_unitofmeasuredefaultbaseunits(context);             context.savechanges();             _additionalseed.seed_unitofmeasuredefaultrelatedunits(context);             context.savechanges();              _additionalseed.seed_terms(context);              _additionalseed.seed_taxforms(context);             context.savechanges();             _additionalseed.seed_taxformdetail(context);              _additionalseed.seed_accounttypes(context);             context.savechanges();              _additionalseed.seed_industries(context);             context.savechanges();              _additionalseed.seed_organizationtypes(context);             context.savechanges();         }     } } 

when comment line out following error:

"sequence contains more 1 element" @ line 12 of taxformdetail.cs

the code class file on 1200 lines supply unique lines:

namespace model.migrations.seeddata {     using system;     using system.data.entity;     using system.data.entity.migrations;     using system.linq;      public partial class additionalseed     {         public void seed_taxformdetail(applicationdbcontext context)         {             context.taxformdetail.addorupdate(                 r => new { r.taxformid, r.taxcodelinedescription },                 new taxformdetailmodel() { taxcodelinenumber = null, taxcodelinedescription = "schedule f: interest expense, mortgage", taxformid = context.taxforms.firstordefault(r => r.taxform.equals("1040")).recordid },                 .....                 new taxformdetailmodel() { taxcodelinenumber = null, taxcodelinedescription = "pt i-unrel bus inc: sch c, l3-inc-real/pers prop", taxformid = context.taxforms.firstordefault(r => r.taxform.equals("990-t")).recordid }             );         }     } } 

my model table follows:

[table(name: "taxformdetail")] public class taxformdetailmodel {     [key, required, databasegenerated(databasegeneratedoption.identity)]     public guid recordid { get; set; }      public guid taxformid { get; set; }      public string taxcodelinenumber { get; set; }      [maxlength(255)]     public string taxcodelinedescription { get; set; } } 

i have read numerous google , results on these errors , nothing helps unless have missed something.

edit

the error have stack trace run package manager, there no other way know of of getting else:

system.invalidoperationexception: sequence contains more 1 element    @ system.linq.enumerable.singleordefault[tsource](ienumerable`1 source)    @ system.data.entity.core.objects.elinq.objectqueryprovider.<getelementfunction>b__2[tresult](ienumerable`1 sequence)    @ system.data.entity.core.objects.elinq.objectqueryprovider.executesingle[tresult](ienumerable`1 query, expression queryroot)    @ system.data.entity.core.objects.elinq.objectqueryprovider.system.linq.iqueryprovider.execute[tresult](expression expression)    @ system.data.entity.internal.linq.dbqueryprovider.execute[tresult](expression expression)    @ system.linq.queryable.singleordefault[tsource](iqueryable`1 source, expression`1 predicate)    @ system.data.entity.migrations.dbsetmigrationsextensions.addorupdate[tentity](dbset`1 set, ienumerable`1 identifyingproperties, internalset`1 internalset, tentity[] entities)    @ system.data.entity.migrations.dbsetmigrationsextensions.addorupdate[tentity](idbset`1 set, expression`1 identifierexpression, tentity[] entities)    @ model.migrations.seeddata.additionalseed.seed_taxformdetail(applicationdbcontext context) in z:\_profile storage\projects\corporate.web\model\migrations\seeddata\taxformdetail.cs:line 12    @ model.migrations.configuration.seed(applicationdbcontext context) in z:\_profile storage\projects\corporate.web\model\migrations\configuration.cs:line 81    @ system.data.entity.migrations.dbmigrationsconfiguration`1.onseed(dbcontext context)    @ system.data.entity.migrations.dbmigrator.seeddatabase()    @ system.data.entity.migrations.infrastructure.migratorloggingdecorator.seeddatabase()    @ system.data.entity.migrations.dbmigrator.upgrade(ienumerable`1 pendingmigrations, string targetmigrationid, string lastmigrationid)    @ system.data.entity.migrations.infrastructure.migratorloggingdecorator.upgrade(ienumerable`1 pendingmigrations, string targetmigrationid, string lastmigrationid)    @ system.data.entity.migrations.dbmigrator.updateinternal(string targetmigration)    @ system.data.entity.migrations.dbmigrator.<>c__displayclassc.<update>b__b()    @ system.data.entity.migrations.dbmigrator.ensuredatabaseexists(action mustsucceedtokeepdatabase)    @ system.data.entity.migrations.infrastructure.migratorbase.ensuredatabaseexists(action mustsucceedtokeepdatabase)    @ system.data.entity.migrations.dbmigrator.update(string targetmigration)    @ system.data.entity.migrations.infrastructure.migratorbase.update(string targetmigration)    @ system.data.entity.migrations.design.toolingfacade.updaterunner.run()    @ system.appdomain.docallback(crossappdomaindelegate callbackdelegate)    @ system.appdomain.docallback(crossappdomaindelegate callbackdelegate)    @ system.data.entity.migrations.design.toolingfacade.run(baserunner runner)    @ system.data.entity.migrations.design.toolingfacade.update(string targetmigration, boolean force)    @ system.data.entity.migrations.updatedatabasecommand.<>c__displayclass2.<.ctor>b__0()    @ system.data.entity.migrations.migrationsdomaincommand.execute(action command) sequence contains more 1 element 

i figured out workaround situation.

for "validation failed 1 or more entities. see 'entityvalidationerrors' property more details." @ line 89 of configuration.cs error, changed seed method check existing data specific table (tax code) , if table empty, add records not add or update.

as far "sequence contains more 1 element" @ line 12 of taxformdetail.cs goes, did same thing.

now every time update-database pm command, not more errors.