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."
Whenever Bedlinog tackle Penallta a massive fixure is guaranteed but this Sunday there will be even more emphasis placed on the two rivals when they contest the SSE Swalec Plate final at Principality Stadium.
Ahead of their SSE SWALEC Bowl Final clash with Taffs Well at Principality Stadium on Sunday, Burry Port share their #FABXV nomination with WRUTV in the search for Welsh rugby's greatest volunteers. Everyone can get involved by sending nominations via twitter to @WRU_Community using the hashtag #FABXV
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SWALEC ambassador Shane WIlliams is looking forward to Sunday's Finals Day where the Cup, Bowl and Plate offers a great opportunity for players and teams to experience the magic of playing at Principality Stadium
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Meet Aberdare coach Luke Thomas whose #FABXV nomination goes to super volunteer Daz with a whopping 10 things he does for the club each week, all except the ironing! You can also join in the search for Welsh rugby's greatest volunteers, by sending your nomination via twitter to @WRU_Community using the hashtag #FABXV