In Moss/Sharepoint, some while playing with placeholders in the master pages we face the error like the below screen.
Solution
The solution for the above problem is that either
1) To remove placeholders from the master page or
2) (Best One) Increase the value of the MaxControls attribute in the web.config of the corresponding web application as highlighted below.
The above screen shows that the number of placeholders that can be included in a master page has been exceeded. Solution
The solution for the above problem is that either
1) To remove placeholders from the master page or
2) (Best One) Increase the value of the MaxControls attribute in the web.config of the corresponding web application as highlighted below.

