Struts 7.0.1 JakartaMultiPartRequest

I get this warning:

2025-02-02 10:06:49,238 WARN 
org.apache.struts2.dispatcher.multipart.JakartaMultiPartRequest 
JakartaMultiPartRequest:processNormalFormField - Form field 
[action:myFiles!upload] is rejected!

2025-02-02 10:07:31,275 WARN 
org.apache.struts2.dispatcher.multipart.JakartaMultiPartRequest 
JakartaMultiPartRequest:processNormalFormField - Form field 
[action:myFiles!upload] is rejected!

and the upload does not work now.

My form is

<s:form id="uploadFiles" action="myFiles" method="POST" 
enctype="multipart/form-data">

<s:file name="uploadedFiles" size="95" multiple="multiple" /> <s:file 
name="uploadedFiles" size="95" multiple="multiple" /> <s:submit 
value="upload" action="myFiles!upload" />

</s:form>