ERROR: CREATE_CLIENT:RuntimeException: Parse error reading JWS

I am getting the below. I see from previous posts the solution has been recommended to try again. How long should I have to be trying again before it works please?

ERROR: CREATE_CLIENT:RuntimeException: Parse error reading JWS in /homepages/22/d808589855/htdocs/app808590037/wp-content/plugins/wp-letsencrypt-ssl/lib/LEConnector.php:188
Stack trace:
#0 /homepages/22/d808589855/htdocs/app808590037/wp-content/plugins/wp-letsencrypt-ssl/lib/LEConnector.php(227): WPLEClient\WPLEConnector->request(‘POST’, ‘https://acme-v0…’, ‘{“protected”:”e…’)
#1 /homepages/22/d808589855/htdocs/app808590037/wp-content/plugins/wp-letsencrypt-ssl/lib/LEAccount.php(99): WPLEClient\WPLEConnector->post(‘https://acme-v0…’, ‘{“protected”:”e…’)
#2 /homepages/22/d808589855/htdocs/app808590037/wp-content/plugins/wp-letsencrypt-ssl/lib/LEAccount.php(73): WPLEClient\LEAccount->createLEAccount(‘richard.moules@…’)
#3 /homepages/22/d808589855/htdocs/app808590037/wp-content/plugins/wp-letsencrypt-ssl/lib/LEClient.php(141): WPLEClient\LEAccount->__construct(Object(WPLEClient\WPLEConnector), 1, ‘richard.moules@…’, Array)
#4 /homepages/22/d808589855/htdocs/app808590037/wp-content/plugins/wp-letsencrypt-ssl/classes/le-core.php(100): WPLEClient\WPLEClient->__construct(‘richard.moules@…’, false, 1, ‘/homepages/22/d…’)
#5 /homepages/22/d808589855/htdocs/app808590037/wp-content/plugins/wp-letsencrypt-ssl/classes/le-core.php(76): WPLE_Core->wple_create_client()
#6 /homepages/22/d808589855/htdocs/app808590037/wp-content/plugins/wp-letsencrypt-ssl/classes/le-core.php(62): WPLE_Core->wple_generate_verify_ssl()
#7 /homepages/22/d808589855/htdocs/app808590037/wp-content/plugins/wp-letsencrypt-ssl/admin/le_admin.php(337): WPLE_Core->__construct(Array)
#8 /homepages/22/d808589855/htdocs/app808590037/wp-includes/class-wp-hook.php(288): WPLE_Admin->wple_save_email_generate_certs(”)
#9 /homepages/22/d808589855/htdocs/app808590037/wp-includes/class-wp-hook.php(312): WP_Hook->apply_filters(NULL, Array)
#10 /homepages/22/d808589855/htdocs/app808590037/wp-includes/plugin.php(478): WP_Hook->do_action(Array)
#11 /homepages/22/d808589855/htdocs/app808590037/wp-admin/admin.php(170): do_action(‘admin_init’)
#12 {main}