ARG-5 Error shown besides usernames in forumview

[Tauhid]

There is a solution that someone from skinbox helped me upon:

For your style's search_threadbit template, find:
{vb:rawphrase started_by_x_y_z_a, {vb:link member, {vb:raw thread}, null, 'postuserid', 'postusername'}, {vb:raw thread.postusername}, {vb:raw thread.startdate}, {vb:raw thread.starttime}}

and then replace it with:
{vb:rawphrase started_by_x_y_z_a, {vb:link member, {vb:raw thread}, null, 'postuserid', 'postusername'}, {vb:raw thread.postusername}, {vb:raw thread.startdate}, {vb:raw thread.starttime}, {vb:stylevar dirmark}}