An unhandled error occured

Unable to access lock file for data source 'SMLog'

Stack trace
#0 /var/www/html/base/SMDataSource.classes.php(364): SMDataSourceCacheItem->Lock()
#1 /var/www/html/base/SMLog.class.php(105): SMDataSource->Lock()
#2 /var/www/html/base/SMLog.class.php(20): SMLog::Log('/var/www/html/b...', 406, 'Error 8192: Fun...')
#3 /var/www/html/base/SMController.class.php(406): SMErrorHandler(8192, 'Function get_ma...', '/var/www/html/b...', 406, Array)
#4 /var/www/html/base/SMController.class.php(83): SMController->disableMagicQuotes()
#5 /var/www/html/index.php(21): SMController->__construct()
#6 {main}

WARNING: Unable to release data source file locks during exception handling.

An unhandled error occured

Unable to write data to resource 'SMLog' - data corrupted, possibly due to use of invalid character set

Stack trace
#0 /var/www/html/base/SMLog.class.php(108): SMDataSource->Commit()
#1 /var/www/html/base/SMLog.class.php(20): SMLog::Log('/var/www/html/b...', 210, 'Error 2: flock(...')
#2 [internal function]: SMErrorHandler(2, 'flock() expects...', '/var/www/html/b...', 210, Array)
#3 /var/www/html/base/SMSqlCommon.classes.php(210): flock(false, 3)
#4 /var/www/html/base/SMDataSource.classes.php(370): SMDataSourceCacheItem->Unlock()
#5 /var/www/html/base/SMLog.class.php(48): SMDataSource->Unlock()
#6 [internal function]: SMExceptionHandler(Object(Exception))
#7 {main}

It may be necessary to delete all *.lock files from the data folder on the server.