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First-Aid Kit

This section contains the most common issues that you might face when developing OpenUI5 apps and how to solve them.

• [An Empty Page Comes Up](an-empty-page-comes-up-55db2bc.md “”)

• [Content or Control Is Not Visible](content-or-control-is-not-visible-492d9d9.md “”)

• Request Fails Due to Same-Origin Policy (Cross-Origin Resource Sharing - CORS)

• [App or Control Looks Odd](app-or-control-looks-odd-c34413d.md “”)

• View or Controller Extension is Not Loaded
  You have extended a view or controller by defining sap.ui5/extends/extensions/sap.ui.controllerExtensions or sap.ui5/extends/extensions/sap.ui.viewExtensions in your Component’s manifest.json, but at runtime neither are loaded.

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