ok, I solved the bug.
I had a table called user which is quite an often used word in SQL Syntax, even for MSSQL. so the error was in the creole driver as said in the error message. just change the according line to:
$res = mssql_query("sp_columns [".$this->name."]", $this->conn->getResource());
and you might use this debugging code: above the command.
echo "------------------- \n\n SQL QUERY: \n\n";
echo "sp_columns ".$this->name;
echo "\n\n-------------------\n"
and change line 87:
$res = mssql_query("sp_indexes_rowset [".$this->name."]", $this->conn->getResource());