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The spring:form tag was added to the openmrs header in 1.7.  See this line in include.jsp:

<%@ taglib prefix="form" uri="/WEB-INF/taglibs/spring-form.tld" %>

...

How to fix this error?

/WEB-INF/view/module/growthchart/growthChartForm.jsp(3,72) Attempt to redefine the prefix form to http://www.springframework.org/tags/form, when it was already defined as /WEB-INF/taglibs/spring-form.tld in the current scope.

Solution #1:
If you want to retain backwards compatibility in your module, don't use "form" in your header, e.g. change to using this in your header: <%@ taglib prefix="springform" uri="/WEB-INF/taglibs/spring-form.tld" %>
and this: <springform:form ...> in your code.

Remember to remove lines in your header that looks like 

<%@taglib prefix="form" uri="http://www.springframework.org/tags/form"%> or raglib which prefixes form

Solution #2:
If you don't want to support OpenMRS 1.6 or below:
1) delete the taglib prefix in your header
2) Change your config.xml to have at least 1.7 in the require_openmrs_version element.