Some web request that is supposed to return JSON has obviously returned some HTML-formatted error message instead.
Find out in the network tab of your browser dev tools what this particular request is. As a matter of fact, anytime you see this particular error "Unexpected token <" this is the first thing you should *always* check. - Jackie You wrote: Using Mapserver2017, react viewer - layout is not displayed. how to fix error: We get an "Unexpected token '<', "
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