An internal error occurred during: "Building Workspace".

When EXTJS4 is added to the Web project in Eclipse, an internal error occurred during: "Building Workspace" appears.

Java Heap Space error.

Solution 1: The EXTJS4 Project installation package do not put in the Web project is OK, or suggest directly with MyEclipse directly imported EXJTS4 package, there is no problem.

Workaround 2: Import the ExtJS package so that it will get stuck with eclipse. Go to the project root, locate the. Project, open it in Notepad, and delete the two places:

First place:

<buildCommand>
<name>org.eclipse.wst.jsdt.core.javascriptValidator</name>
<arguments>
</arguments>
</buildCommand>
Second place:

<nature>org.eclipse.wst.jsdt.core.jsNature</nature>

Save the exit and refresh the project. and copy the Ext package into the project.

An internal error occurred during: "Building Workspace".