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2025.10
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Studio user guide

Last updated Feb 18, 2026

Troubleshooting

This page provides valuable insights and solutions to common issues encountered during the development and execution of coded automations.

Type X cannot be serialized

If your coded automation returns complex types that are not implemented in the coded interface, you will likely receive an error stating that a specific type cannot be serialized. Additionally, the error message recommends to mark the type with the DataContract attribute.

To solve this issue, follow these steps:

  1. Add the DataContract attribute to each class in the coded automation.
  2. Add the DataMember attribute to every property of the class.
  3. Manually import the System.Runtime.Serialization namespace: using System.Runtime.Serialization.
using System;
using System.Runtime.Serialization;
using System.Collections.Generic;
using System.Data;
using UiPath.Core;
using UiPath.Core.Activities.Storage;
using UiPath.MicrosoftOffice365.Activities.Api;
using UiPath.Orchestrator.Client.Models;

namespace ClassifyCalendarEvents
{
    [DataContract]
    public class Attendee
    {
        [DataMember] public string Email { get; set; }
        [DataMember] public string Name { get; set; }
        [DataMember] public string MeetingStatus { get; set; } // e.g., "Accepted", "Declined", "Tentative"
        [DataMember] public string Role { get; set; } // e.g., "Organizer", "Speaker", "Participant"
        [DataMember] public string Type { get; set; } // e.g., "Internal", "External"

        }
}
using System;
using System.Runtime.Serialization;
using System.Collections.Generic;
using System.Data;
using UiPath.Core;
using UiPath.Core.Activities.Storage;
using UiPath.MicrosoftOffice365.Activities.Api;
using UiPath.Orchestrator.Client.Models;

namespace ClassifyCalendarEvents
{
    [DataContract]
    public class Attendee
    {
        [DataMember] public string Email { get; set; }
        [DataMember] public string Name { get; set; }
        [DataMember] public string MeetingStatus { get; set; } // e.g., "Accepted", "Declined", "Tentative"
        [DataMember] public string Role { get; set; } // e.g., "Organizer", "Speaker", "Participant"
        [DataMember] public string Type { get; set; } // e.g., "Internal", "External"

        }
}

Publishing errors

Publishing errors occur when trying to compile or publish a project. These errors are tied to issues within coded workflows and project configurations, and are specifically linked to reserved keywords or syntax conflicts within the project name or internal structure (project.json or namespace handling).

Error Codes

  • CS1001: Identifier expected. Indicates a missing or invalid identifier in the code.
  • CS0116: A namespace cannot directly contain members such as fields, methods, or statements. Suggests improperly placed code within the namespace.
  • CS1514: { expected. A curly brace { to start a block of code is missing.
  • CS1022: Type or namespace definition, or end-of-file expected. Indicates improper placement of definitions or an incomplete file structure.

Root Cause

  • Use of reserved keywords: The project name includes a reserved keyword (e.g., "for"), which conflicts with C# syntax rules and causes compilation errors.
  • Direct modifications to the project.json file: Manual changes to project.json may inadvertently result in incorrect project configuration.
  • Coded workflows misinterpreted by the compiler: Certain workflows may contain coding structures that are incompatible with the reserved keywords in the project name.

Resolution

To solve this issue, perform one or more of the following actions.

  • Rename the project: Check if the project name does not contain reserved keywords (e.g., "for"). Use a unique and valid name without conflicting keywords or special characters.
  • Rename the project folder and update the project.json file to match the new name.
  • Modify coded workflows: If there are coded workflows in the project files, ensure that references to the old project name (with reserved keywords) are updated to reflect the new name. Address compiler misinterpretation by ensuring proper syntax and namespace configurations in coded workflows.
  • Back up and avoid editing project.json directly: Take a backup of the project folder before making changes. Avoid manually editing the project.json file unless necessary. It is better to use UiPath Studio to make project configuration changes.
  • Validate the project structure and syntax: Open the renamed project in UiPath Studio and verify that all configurations, workflows, and namespace structures are valid and aligned with C# syntax rules. Compile or publish the project to confirm that the errors are resolved.

Best Practices

  • Use descriptive and well-structured project names, avoiding reserved keywords, special characters, or numerical-only names.
  • Follow standard coding practices when dealing with coded workflows in UiPath Studio to ensure compatibility.
  • Maintain backups prior to any changes, particularly before modifying critical files like project.json.

By implementing the above steps, publishing errors (CS1001, CS0116, CS1514, CS1022) can be resolved, allowing for successful compilation and workflow execution in UiPath Studio.

  • Type X cannot be serialized
  • Publishing errors

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