"No file uploaded or invalid file type!" when uploading css in OJS3

@inferlinkdev wrote:

I'm trying to upload a css file. I've successfully uploaded them before but for some reason, I'm getting a popup error that says "No file uploaded or invalid file type!"

This is my css

 .sidebar-widget-header {
  background-color: #37738b;
  padding: 5px;
  color: white;
  font-weight: bold;
}

/******************************************
 * home page
 ******************************************/

/********************
 * Articles section
 *********************/

section.current_issue section.section > .page-header {
  display: none;
}

/*
.media-list {
  -moz-column-count: 2;
  -webkit-column-count: 2;
  column-count: 2;
}
*/

.media {
  float: left;
  width: 50%;
}

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