Easterby was hugely disappointed with the Scarlets defeat
Simon Easterby admits the Scarlets must wise up to avoid falling to another "embarrassing" defeat.
The west Wales region kicked off their RaboDirect Pro12 season with a 42-19 defeat to reigning champions Leinster.
Easterby's men appeared on course for an impressive victory at Parc y Scarlets after leading by six-points at the interval.
But Leinster ran riot in the second-half with three tries coming in the space of just 13 minutes.
"We felt we produced some really good rugby in the first half and were in control, but we conceded an early try in that second half, lost our composure and never got control back.
"Our scrum was good, we had good possession and field position and the scoreboard was ticking over.
"We did everything we talked about ahead of the game but after half-time we had a bit of meltdown. We started chasing things, the more we chased things the more we tried to force things and the ball was more often than not lost.
"We can't fault what we were doing up until half time. But some individual error, composure lost and maybe our leadership was lacking.
"We have to improve our game management, we have to make sure we don't embarrass ourselves again.
"Mistakes are frustrating and if you make that many it is very difficult to win a game of rugby. When you have a team that capitalise on mistakes like Leinster, you are going to put yourself under pressure."
The Scarlets woes were compounded by an injury to Joe Snyman. The South African second-row left the field with his arm in a makeshift sling and he will be assessed today.
"We're not sure on the extent of Joe's injury yet. We picked up a couple of bumps but hopefully nothing too serious."
WRU TV were on hand at the launch of a major new commercial deal with WRU and Mercedes-Benz South Wales (part of the Sinclair Group), which sees the family company become an official supplier to the Welsh Rugby Union
On the back of the recent Women's Rugby World Cup, the WRU has launched a revitalised Women's and Girls domestic seasonal structure, and the future is looking bright.
Go to www.wru.co.uk/tryourgame for more information
Roger Lewis talks to WRU TV at the announcement of a new £60 million Rugby Services Agreement (RSA) which provides a new and positive contractual relationship between the WRU and its four Regions for the next six years has been agreed.
The Welsh Rugby Union has announced a major new sponsorship deal with Gullivers Sports Travel which will make the UK's leading, and longest established, multi-sport tour operator, an Official Supplier for the rest of the decade.
Having taken part in seven World Cups as a player and coach, Liza Burgess hopes to go out in style this afternoon when Wales take on Australia in the Play-off for seventh and eighth place in the Women's Rugby World Cup in Paris.