Tell us all the steps you went through to do this. Note that you should _not_ be using the core admin in the admin UI if you're working with SolrCloud.
For stand-alone Solr, the message above is probably caused by your not having a conf directory set up already. The core admin UI expects that you have a pre-existing directory with a "conf" directory that contains solrconfig.xml, schema.xml, and all the rest of the configuration files. You can specify this via some of the parameters on the admin UI screen (see instanceDir and dataDir). Each core must be in a separate directory or Bad Things Happen. HTH, Erick On Tue, Mar 24, 2015 at 7:01 AM, Alejandro Jesus Mariño Molerio <ajmar...@estudiantes.uci.cu> wrote: > Dear Solr Community: > I just began to work with Solr. I choose Solr 5.0, but when I try to create a > new core with GUI, show the following error: " Error CREATEing SolrCore > 'datos': Unable to create core [datos] Caused by: Can't find resource > 'solrconfig.xml' in classpath or 'C:\solr\server\solr\datos\conf'". My > question is simple, How can fix this problem?. > > Thanks in advance for your consideration. > Alejandro.