I get this error when trying to access my single blog page. Any of them. Fatal error: Call to undefined function bbp_get_dynamic_roles() in /public_html/wp-content/plugins/user-role-editor-pro/pro/includes/classes/bbpress.php on line 57.
I tested the function directly in my functions.php file and it worked.
It seems, that wp_init_roles action fires at your site earlier, than active bbPress plugin loads its .php files.
Can you try beta version 4.42.b2 (available from the same download page after login)?
It includes a related update:
Load required .php files from the active bbPress plugin directly, as URE code may be executed earlier than they are loaded by bbPress in some cases.