If you see either of the following messages in Salesforce:
Oops, there was as error rendering Force.com Canvas application [Alfresco_Salesforce_Connector]
[Alfresco_for_Salesforce]. Canvas can not locate an installed canvas app with the namespace [] and API name [Alfresco_for_Salesforce].
Check whether a connected app definition exists for Alfresco, and that the API Name property in the Alfresco Setup page has been defined with the correct value. The values in the Alfresco connected app definition and API Name must match. See Step 3: Configure app in Salesforce for more guidance.