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Entity Framework Code First Migrations Error - "Sequence contains more than one element."

I am building an application which utilizes code first migrations in entity framework.

Previously, I have been able to add migrations and update the database, however, recently I added a c# class to the application and added the migration. Now when I update the database I get the error message "Sequence contains more than one element." I cannot figure why this is happening and I need some one to help me with code so I can correct this issue and update the database.

Квалификация: Программирование на C#, .NET

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О работодателе:
( 9 отзыв(-а, -ов) ) Bloomfield, United States

ID проекта: #21868621

Поручен:

FtcITGuys

Hi, I have experience with EF code first migrations. I might be able to help you. Thanks.

$30 USD за 1 день
(7 отзывов(-а))
4.1

17 фрилансеров(-а) в среднем готовы выполнить эту работу за $143

ppgjsc

Hi I read the project description with interest. I strongly believe I am the proper candidate. I fit all the requirements you mentioned, including entity framework Please check my profile and past reviews. Let us dis Больше

$140 USD за 2 дней(-я)
(25 отзывов(-а))
7.3
NewFuture338

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$140 USD за 7 дней(-я)
(28 отзывов(-а))
6.1
KOKTech

Hello, How are you? I am a senior full stack developer who has rich experiences with entity framework code first development. I read your requirements and I am really interested in your project. I want to discuss the p Больше

$140 USD за 7 дней(-я)
(15 отзывов(-а))
5.9
IjazSe

Dear Sir/Madam, Hop you are doing great!. I am Entity framework code first expert and can surely assist you with my service in fixing the bug right now via ANY DESK. Looking forward for your positive response. Best Больше

$100 USD за 1 день
(28 отзывов(-а))
5.5
hardikshah83

I will troubleshoot the issue, can start immediately. Programmer with more than 10 years of development experience here. I have handled production applications with various technologies like .NET, PHP, Classic ASP and Больше

$100 USD за 3 дней(-я)
(20 отзывов(-а))
5.0
JinTai

I've checked your project requirement and understood whole work scale. Familiar interface and simple algorithm encourage your work. Languages: Objective C , Swift , PHP, Java, SQL, HTML, CSS, JavaScript, C, C++, C#,Py Больше

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(1 отзыв)
3.4
AlexeyKala

⭐ .Net expert here using Entity Framework⭐ I have read your description carefully and very interesting for your project. I am sure I can give you perfect results on time and I can keep good communication with you ev Больше

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(1 отзыв)
2.2
superdev1888

Hello Did you use oracle???????? I read your description carefully. I am a software engineer and have done many desktop applications. Expert in JAVA / C/C++ / C# / .NET / Python / VB. And all the projects will be de Больше

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2.4
Artemrodin1987

Hello client!!! I have just read in your requires carefully and enjoy working with ones like that. I can complete your tasks perfectly in short time because I'm an excellent software engineer that have powerful techniq Больше

$200 USD за 7 дней(-я)
(2 отзывов(-а))
1.8
JennyHazard

Hello, Previously, adding migrations and updating the database worked well, but after adding any c# class, you get the error message "Sequence contains more than one element." I think that's why there would be error ab Больше

$120 USD за 3 дней(-я)
(1 отзыв)
1.3
mihail99999

*****_ Hello Robert H., _***** How are you ? I have read your detail very carefully and understood what you want. I have developed a lot of project like your project, so i have rich experience and so i can complete you Больше

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(0 отзывов(-а))
0.0
CCampbellGLA

I eat this kind of debugging for breakfast :) I will need access to the code, obviously (either access to your source control or a zip file of the project). Very quick turnaround, or no charge.

$140 USD за 1 день
(0 отзывов(-а))
0.0
jacksmithmnb

Let me figure out what is wrong and fix it

$200 USD за 2 дней(-я)
(0 отзывов(-а))
0.0
Dito24

Hello, How are you? I have 8+ years of experience in C#/C++/JAVA programming. I have read your project description fully. I can understand and finish it wonderfully . I guarantee high project development and qualit Больше

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(0 отзывов(-а))
0.0
sanwalz

That just requires excellent analytical and problem solving skills along with technical 1s. Think got them all. Lets give it a try. Regards

$250 USD за 7 дней(-я)
(0 отзывов(-а))
0.0
vukstudio

Dear we will do this task for you in very low cost because we are very experts in this C#. We will do it in couples of minutes. Feel free to contact us. Thanks. Just allow me to help you in code through team viewer Больше

$140 USD за 7 дней(-я)
(0 отзывов(-а))
0.0