Important if you use a table prefixe in your database (user warning: Table 'database.node' doesn't exist query: SELECT n.nid, n.

In line number 163 of the module file (teaser_block.module), you must add brackets in the node words.
$result = db_query(db_rewrite_sql('SELECT n.nid, n.title FROM {node} n '. $types .' ORDER BY n.title'));
instead of:
$result = db_query(db_rewrite_sql('SELECT n.nid, n.title FROM node n '. $types .' ORDER BY n.title'));
It's important to make you request match the right table inthe right database. Especially if you use table prefix in your db.