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Quick&nbsp;guess,&nbsp;you&nbsp;may&nbsp;have&nbsp;an&nbsp;extra&nbsp;space&nbsp;or&nbsp;\r&nbsp;at&nbsp;the&nbsp;end&nbsp;of&nbsp;the&nbsp;PROJECT&nbsp;line&nbsp;in&nbsp;the&nbsp;Makefile.&lt;br&gt;&lt;br&gt;Sent&nbsp;from&nbsp;my&nbsp;ASUS&nbsp;Padfone&lt;br&gt;&lt;br&gt;[email protected]&nbsp;wrote:&lt;br&gt;&lt;br&gt;&gt;Hello,&lt;br&gt;&gt;&lt;br&gt;&gt;***&nbsp;GOAL:&nbsp;&lt;br&gt;&gt;&lt;br&gt;&gt;Modify&nbsp;rest_pastebin&nbsp;in&nbsp;Cowboy&nbsp;examples.&lt;br&gt;&gt;&lt;br&gt;&gt;***&nbsp;PROCEDULE&nbsp;1:&nbsp;&lt;br&gt;&gt;&lt;br&gt;&gt;-&nbsp;Pulled&nbsp;Cowboy,&nbsp;including&nbsp;examples&nbsp;into&nbsp;local&nbsp;workstation&lt;br&gt;&gt;-&nbsp;Copied&nbsp;rest_pastebin&nbsp;to&nbsp;a&nbsp;separate&nbsp;directory&lt;br&gt;&gt;-&nbsp;Execute&nbsp;make&lt;br&gt;&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Make&nbsp;compiles&nbsp;just&nbsp;fine&lt;br&gt;&gt;&lt;br&gt;&gt;***&nbsp;PROCEDUE&nbsp;2&nbsp;--&nbsp;resulting&nbsp;in&nbsp;error&lt;br&gt;&gt;&lt;br&gt;&gt;-&nbsp;delete&nbsp;the&nbsp;entire&nbsp;rest_pastebin&nbsp;application&nbsp;and&nbsp;recopy&nbsp;from&nbsp;the&nbsp;Cowboy&nbsp;pull&lt;br&gt;&gt;-&nbsp;change&nbsp;all&nbsp;module&nbsp;names&nbsp;and&nbsp;references&nbsp;from&nbsp;rest_pastebin&nbsp;to&nbsp;tagr.&nbsp;Thus&nbsp;rest_pastebin_sup.erl&nbsp;becomes&nbsp;tagr_sup.erl&lt;br&gt;&gt;-&nbsp;Execute&nbsp;make&lt;br&gt;&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Make&nbsp;returns:&lt;br&gt;&gt;&lt;br&gt;&gt;...&lt;br&gt;&gt;make[1]:&nbsp;Leaving&nbsp;directory&nbsp;`/home/lloyd/Erl/CB/tagr/deps/cowboy&#39;&lt;br&gt;&gt;&nbsp;ERLC&nbsp;&nbsp;&nbsp;toppage_handler.erl&nbsp;tagr_sup.erl&nbsp;tagr_app.erl&lt;br&gt;&gt;&nbsp;ERLC&nbsp;&nbsp;&nbsp;toppage_handler.erl&nbsp;tagr_sup.erl&nbsp;tagr_app.erl&lt;br&gt;&gt;&nbsp;APP&nbsp;&nbsp;&nbsp;&nbsp;tagr&nbsp;.app.src&lt;br&gt;&gt;cat:&nbsp;src/tagr:&nbsp;No&nbsp;such&nbsp;file&nbsp;or&nbsp;directory&lt;br&gt;&gt;cat:&nbsp;.app.src:&nbsp;No&nbsp;such&nbsp;file&nbsp;or&nbsp;directory&lt;br&gt;&gt;sed:&nbsp;can&#39;t&nbsp;read&nbsp;.app:&nbsp;No&nbsp;such&nbsp;file&nbsp;or&nbsp;directory&lt;br&gt;&gt;make:&nbsp;***&nbsp;[app]&nbsp;Error&nbsp;2&lt;br&gt;&gt;&lt;br&gt;&gt;Note&nbsp;that&nbsp;the&nbsp;filename&nbsp;tagr.app.src&nbsp;has&nbsp;somehow&nbsp;been&nbsp;modified&nbsp;to&nbsp;tagr&nbsp;.app.src&lt;br&gt;&gt;&lt;br&gt;&gt;But&nbsp;here&#39;s&nbsp;the&nbsp;directory&nbsp;listing:&nbsp;&lt;br&gt;&gt;&lt;br&gt;&gt;-rw-rw-r--&nbsp;1&nbsp;lloyd&nbsp;lloyd&nbsp;&nbsp;436&nbsp;Dec&nbsp;26&nbsp;18:21&nbsp;tagr_app.erl&lt;br&gt;&gt;-rw-rw-r--&nbsp;1&nbsp;lloyd&nbsp;lloyd&nbsp;&nbsp;299&nbsp;Dec&nbsp;26&nbsp;18:22&nbsp;tagr.app.src&lt;br&gt;&gt;-rw-rw-r--&nbsp;1&nbsp;lloyd&nbsp;lloyd&nbsp;&nbsp;382&nbsp;Dec&nbsp;26&nbsp;18:22&nbsp;tagr_sup.erl&lt;br&gt;&gt;-rw-rw-r--&nbsp;1&nbsp;lloyd&nbsp;lloyd&nbsp;3568&nbsp;Dec&nbsp;26&nbsp;18:23&nbsp;toppage_handler.erl&lt;br&gt;&gt;&lt;br&gt;&gt;I&nbsp;can&nbsp;load&nbsp;tagr.app.src&nbsp;in&nbsp;Vim.&nbsp;Using&nbsp;find&nbsp;I&#39;ve&nbsp;searched&nbsp;for&nbsp;tagr&nbsp;and&nbsp;.app.src&nbsp;with&nbsp;negative&nbsp;results.&lt;br&gt;&gt;&lt;br&gt;&gt;Further&nbsp;mystery.&nbsp;I&nbsp;substituted&nbsp;Rebar&nbsp;for&nbsp;relx.&nbsp;Tagr&nbsp;now&nbsp;compiles&nbsp;just&nbsp;fine.&lt;br&gt;&gt;&lt;br&gt;&gt;***&nbsp;Discussion&lt;br&gt;&gt;&lt;br&gt;&gt;I&nbsp;stumbled&nbsp;on&nbsp;this&nbsp;problem&nbsp;after&nbsp;making&nbsp;fairly&nbsp;extensive&nbsp;modifications&nbsp;to&nbsp;rest_pastebin.&nbsp;Through&nbsp;much&nbsp;of&nbsp;the&nbsp;process&nbsp;it&nbsp;compiled&nbsp;just&nbsp;fine&nbsp;until&nbsp;it&nbsp;didn&#39;t.&nbsp;And&nbsp;from&nbsp;then&nbsp;on&nbsp;I&nbsp;could&nbsp;not&nbsp;get&nbsp;it&nbsp;to&nbsp;compile.&nbsp;I&nbsp;tried&nbsp;everything&nbsp;I&nbsp;could&nbsp;think&nbsp;of:&nbsp;careful&nbsp;source&nbsp;code&nbsp;review&nbsp;(at&nbsp;least&nbsp;10&nbsp;passes),&nbsp;searching&nbsp;for&nbsp;tagr&nbsp;.app.src,&nbsp;trying&nbsp;different&nbsp;names&nbsp;(e.g.&nbsp;tagger),&nbsp;rebooting&nbsp;my&nbsp;computer,&nbsp;etc.,&nbsp;etc.&lt;br&gt;&gt;&lt;br&gt;&gt;Eventually&nbsp;I&nbsp;reduced&nbsp;the&nbsp;problem&nbsp;to&nbsp;the&nbsp;absolute&nbsp;minimum:&nbsp;Change&nbsp;the&nbsp;string&nbsp;rest_pastebin&nbsp;to&nbsp;tagr&nbsp;everywhere&nbsp;relevant.&nbsp;&lt;br&gt;&gt;&lt;br&gt;&gt;It&#39;s&nbsp;possible&nbsp;I&#39;m&nbsp;missing&nbsp;something&nbsp;somewhere.&nbsp;But&nbsp;where&nbsp;should&nbsp;I&nbsp;look?&nbsp;Otherwise,&nbsp;is&nbsp;it&nbsp;possible&nbsp;that&nbsp;there&nbsp;is&nbsp;a&nbsp;subtle&nbsp;bug&nbsp;in&nbsp;relx?&lt;br&gt;&gt;&lt;br&gt;&gt;&lt;br&gt;&gt;Many&nbsp;thanks,&lt;br&gt;&gt;&lt;br&gt;&gt;Lloyd&lt;br&gt;&gt;&lt;br&gt;&gt;&lt;br&gt;&gt;&lt;br&gt;&gt;&lt;br&gt;&gt;&lt;br&gt;&gt;&nbsp;&lt;br&gt;&gt;&lt;br&gt;&gt;&lt;br&gt;&gt;&nbsp;&lt;br&gt;&gt;&lt;br&gt;&gt;&lt;br&gt;&gt;&lt;br&gt;&gt;*********************************************&lt;br&gt;&gt;My&nbsp;books:&lt;br&gt;&gt;&lt;br&gt;&gt;THE&nbsp;GOSPEL&nbsp;OF&nbsp;ASHES&lt;br&gt;&gt;http://thegospelofashes.com&lt;b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