[TYPO3-Solr] Exception while trying to index a page > No Solr instance available

[Boris Hinzer]

Hi,

we are facing the problem that pages are not indexed and we are getting 
this error:

exception 'Exception' with message 'No Solr instance available while 
trying to index a page.' in 
/var/www/vhosts/portfolio-institutional.co.uk/httpdocs/typo3conf/ext/solr/classes/class.tx_solr_typo3pageindexer.php:142 

Stack trace:
#0 
/var/www/vhosts/portfolio-institutional.co.uk/httpdocs/typo3conf/ext/solr/classes/class.tx_solr_typo3pageindexer.php(105): 
tx_solr_Typo3PageIndexer->initializeSolrConnection()
#1 [internal function]: tx_solr_Typo3PageIndexer->__construct(Object(tslib_fe))
#2 
/var/www/vhosts/portfolio-institutional.co.uk/httpdocs/typo3_src-4.5.4/t3lib/class.t3lib_div.php(5306): 
ReflectionClass->newInstanceArgs(Array)
#3 
/var/www/vhosts/portfolio-institutional.co.uk/httpdocs/typo3conf/ext/solr/classes/class.tx_solr_indexer.php(98): 
t3lib_div::makeInstance('tx_solr_Typo3Pa...', Object(tslib_fe))
#4 
/var/www/vhosts/portfolio-institutional.co.uk/httpdocs/typo3_src-4.5.4/typo3/sysext/cms/tslib/class.tslib_fe.php(3169): 
tx_solr_Indexer->hook_indexContent(Object(tslib_fe))
#5 
/var/www/vhosts/portfolio-institutional.co.uk/httpdocs/typo3_src-4.5.4/typo3/sysext/cms/tslib/index_ts.php(453): 
tslib_fe->generatePage_postProcessing()
#6 
/var/www/vhosts/portfolio-institutional.co.uk/httpdocs/typo3_src-4.5.4/index.php(84): 
require('/var/www/vhosts...')
#7 {main}

Accessing SOLR through lynx localhost:8080/solr/ works fine.
But lynx localhost:8080/solr/admin doesn't work - I guess because of 
the changed path.
We can acesss SOLR interface when we enter "Admin en_core"

Aditionally SOLR search plugin isn't appearing on search page.

Best regards,

Boris