Avast Mac Security 2015 - error on startup

When I log into my iMac I get an error message popup from Avast Mac Security 2015 saying “Error. Communication with Avast service failed. Error code: 7012. Error indent:Cannot read Avast account info from service.”
Any ideas please how to resolve this? Thanks. Kelvin

What is in the system log file (/var/log/system.log)?

Jan 10 11:55:04 kelvin-wards-imac kernel[0]: com.avast.fileshield: Unmount of /Volumes/Recovery HD detected: Cleaning cached entries.
Jan 10 11:55:04 kelvin-wards-imac com.avast.fileshield[393]: Detected unmount of /Volumes/Recovery HD
Jan 10 11:56:04 kelvin-wards-imac com.apple.xpc.launchd[1] (com.avast.update-agent): This service is defined to be constantly running and is inherently inefficient.
Jan 10 11:56:30 kelvin-wards-imac kernel[0]: com.avast.fileshield Warning: cache_cell_from_vnode: vnode_getattr() failed [2]
Jan 10 11:56:38 kelvin-wards-imac loginwindow[5774]: __43-[SFLListManager applyChange:toList:reply:]_block_invoke Apply change Change: SFLChangeTypeInsert item named: Avast Mac Security [72D5578D-8F69-4F6F-AC9C-D22788A6C18D] - URL:file:///Applications/Avast.app/ to list with identifier com.apple.LSSharedFileList.RecentApplications
Jan 10 11:56:38 kelvin-wards-imac com.apple.xpc.launchd[1] (com.avast.helper): This service is defined to be constantly running and is inherently inefficient.
Jan 10 11:56:52 kelvin-wards-imac WindowServer[5030]: disable_update_timeout: UI updates were forcibly disabled by application “com.avast.helper” for over 1.00 seconds. Server has re-enabled them.
Jan 10 11:56:55 kelvin-wards-imac WindowServer[5030]: common_reenable_update: UI updates were finally reenabled by application “com.avast.helper” after 4.21 seconds [0.24fps] (server forcibly re-enabled them after 1.00 seconds [1.00fps])
Jan 10 11:57:27 kelvin-wards-imac Avast[5892]: Cannot read Avast account info from service
Jan 10 12:00:35 kelvin-wards-imac com.avast.service[353]: BufConn::write: write() failed. Broken pipe [32]

I am receiving the same error message every time. I close and reopen Avast and it’s gone. But I’d like to know why Error 7012 continues to happen every time I start up my MacBook.

Can you please also provide the system log info like “kelvin.ward” did?