[Jack-Devel] Jack will not start

Hello there, I was using Jack until last month. Tried to start it today and nothing. Any ad vice would be appreciated. Tx. JoeF. 15:45:55.995 Statistics reset. 15:45:56.038 ALSA connection change. 15:45:56.260 D-BUS: Service is available (org.jackaudio.service aka jackdbus). Cannot connect to server socket err = No such file or directory Cannot connect to server request channel jack server is not running or cannot be started JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for 4294967295, skipping unlock JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for 4294967295, skipping unlock 15:45:56.346 ALSA connection graph change. 15:45:59.493 D-BUS: JACK server could not be started. Sorry Cannot connect to server socket err = No such file or directory Cannot connect to server request channel jack server is not running or cannot be started JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for 4294967295, skipping unlock JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for 4294967295, skipping unlock Thu Dec 21 15:45:59 2017: Starting jack server... Thu Dec 21 15:45:59 2017: JACK server starting in realtime mode with priority 10 Thu Dec 21 15:45:59 2017: self-connect-mode is "Don't restrict self connect requests" Thu Dec 21 15:45:59 2017: ERROR: Cannot lock down 82274202 byte memory area (Cannot allocate memory) Thu Dec 21 15:45:59 2017: Acquired audio card Audio0 Thu Dec 21 15:45:59 2017: creating alsa driver ... hw:0|hw:0|1024|3|44100|0|0|nomon|swmeter|-|32bit Thu Dec 21 15:45:59 2017: ERROR: ATTENTION: The playback device "hw:0" is already in use. Please stop the application using it and run JACK again Thu Dec 21 15:45:59 2017: ERROR: Cannot initialize driver Thu Dec 21 15:45:59 2017: ERROR: JackServer::Open failed with -1 Thu Dec 21 15:45:59 2017: ERROR: Failed to open server Thu Dec 21 15:46:00 2017: Saving settings to "/home/lulujoe13/.config/jack/conf.xml" ... 15:46:08.819 Could not connect to JACK server as client. - Overall operation failed. - Unable to connect to server. Please check the messages window for more info. Cannot connect to server socket err = No such file or directory Cannot connect to server request channel jack server is not running or cannot be started JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for 4294967295, skipping unlock JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for 4294967295, skipping unlock