Cannot locate entity

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Problem reference: 19092106-8DUVZLP3

Atacama platform activity:
LevelCategoryMessage
INFOcore >>>19092106-8DUVZLP3 Invoking flow: authentication_response
INFOsaml Metadata not available in cache. Requesting reload.
WARNsaml Couldn't get read lock on cache file
ERRORsaml Cannot reload metadata
ERRORsaml Unable to locate issuer in metadata: https://shib.rsc.org/shibboleth
WARNcore Action failed for provider 'SAML:receiveAuthNRequest' in 'authentication_response' flow. Returned status was: NoEntity
WARNcore Data-source 'Apache:request' failed to return any data for parameter 'OA_USER' with match: user
WARNsaml No available response
WARNsaml No available assertion consumer service URL
WARNcore Data-source 'Apache:request' failed to return any data for parameter 'prepend' with match: user
INFOcore <<<19092106-8DUVZLP3 End flow: authentication_response