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Fix SharePoint Error: Cannot Cast SPFieldText to SPFieldMultiChoice

Maira Mehtab Sep 22, 2026 868 views

Question details

The user needs to resolve a SharePoint list update failure caused by an invalid cast error between SPFieldText and SPFieldMultiChoice.

Product: SharePoint
Device & OS: not provided
Scenario: Updating a SharePoint list item via application code, script, or automated workflow.
Observed behavior: The system fails the update and throws an error stating 'Cannot cast SPFieldText to SPFieldMultiChoice' because a text field is being treated as a multi-choice field.

Before you start

Ensure you have Site Owner or Developer permissions for the SharePoint list, as well as access to the workflow, Power Automate flow, or application code responsible for the updates.

Solution 1Recommended

Align SharePoint Field Type with Application Payload

Resolve the casting error by ensuring the SharePoint column configuration perfectly matches the data format your workflow or application is attempting to send.

This error is triggered by a mismatch between the expected field type in SharePoint (SPFieldText, which expects a simple string) and the type of data being sent by the updating code (SPFieldMultiChoice, which implies an array or multi-value object). Fixing this requires verifying the list schema and correcting either the column settings or the code payload.

Access List Settings

Navigate to your target SharePoint list, click the gear icon located in the top right corner, and select 'List settings' from the dropdown menu.

Verify the Column Data Type

Scroll down to the 'Columns' section. Locate the specific column causing the error and verify if its type is currently set to 'Single line of text'.

Check the Internal Name

Click on the column name to open its properties. Inspect the URL in your browser's address bar and note the text following 'Field=' at the very end, as your code must reference this exact internal name instead of the display name.

Adjust the Code Payload

Review your application code or workflow. If the SharePoint column is meant to be 'Single line of text', ensure you are sending a standard text string. If your application is sending an array, combine or format it into a string before executing the update.

Reconfigure the Column (If Required)

If your process genuinely needs to store multiple choices, you must configure the SharePoint column properly. Create a new 'Choice' column, check the 'Allow multiple selections' box, and update your application code to target the new column's internal name.

Avoid Direct Conversion: Do not attempt to directly change an existing text column into a multi-choice column if it already contains data, as this may lead to data loss or corruption. Always create a new column and safely migrate the existing values.

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Frequently Asked Questions

What exactly causes the 'Cannot cast SPFieldText to SPFieldMultiChoice' error?

This error occurs when an external application, script, or automated workflow attempts to save a multi-choice format value (such as an array or a specially formatted object) into a SharePoint column that is strictly configured to accept only a single line of text.

How do I find a SharePoint column's internal name for my code?

Navigate to your SharePoint List Settings and click on the specific column name. Look at the URL in your browser's address bar; the parameter at the very end after 'Field=' is the column's internal name.

Can I easily convert a text field to a multi-choice field in SharePoint?

While SharePoint allows you to modify some field types directly in the List Settings, converting a text column to a multi-choice column is risky and may cause formatting errors or data loss. The recommended practice is to create a brand new multi-choice column and migrate your data.

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