Template render error

Template render error: (/builds/michaelhulsman/footballrs.net/htdocs/content/themes/footballrs.net/node_modules/@frctl/mandelbrot/views/pages/components/detail.nunj)
  Template render error: (/builds/michaelhulsman/footballrs.net/htdocs/content/themes/footballrs.net/node_modules/@frctl/mandelbrot/views/partials/pen/browser.nunj)
  Template render error: (/builds/michaelhulsman/footballrs.net/htdocs/content/themes/footballrs.net/node_modules/@frctl/mandelbrot/views/partials/browser/browser.nunj)
  Template render error: (/builds/michaelhulsman/footballrs.net/htdocs/content/themes/footballrs.net/node_modules/@frctl/mandelbrot/views/partials/browser/panel-notes.nunj)
  Error: TwigException: Twig.expression.type.variable cannot follow a Twig.expression.type.string at template:69 near 'separator...'
    at Object._prettifyError (/builds/michaelhulsman/footballrs.net/htdocs/content/themes/footballrs.net/node_modules/nunjucks/src/lib.js:32:11)
    at /builds/michaelhulsman/footballrs.net/htdocs/content/themes/footballrs.net/node_modules/nunjucks/src/environment.js:464:19
    at eval (eval at _compile (/builds/michaelhulsman/footballrs.net/htdocs/content/themes/footballrs.net/node_modules/nunjucks/src/environment.js:527:18), :44:11)
    at eval (eval at _compile (/builds/michaelhulsman/footballrs.net/htdocs/content/themes/footballrs.net/node_modules/nunjucks/src/environment.js:527:18), :64:12)
    at eval (eval at _compile (/builds/michaelhulsman/footballrs.net/htdocs/content/themes/footballrs.net/node_modules/nunjucks/src/environment.js:527:18), :78:12)
    at eval (eval at _compile (/builds/michaelhulsman/footballrs.net/htdocs/content/themes/footballrs.net/node_modules/nunjucks/src/environment.js:527:18), :144:12)
    at /builds/michaelhulsman/footballrs.net/htdocs/content/themes/footballrs.net/node_modules/nunjucks/src/environment.js:471:11
    at eval (eval at _compile (/builds/michaelhulsman/footballrs.net/htdocs/content/themes/footballrs.net/node_modules/nunjucks/src/environment.js:527:18), :20:11)
    at /builds/michaelhulsman/footballrs.net/htdocs/content/themes/footballrs.net/node_modules/nunjucks/src/environment.js:471:11
    at eval (eval at _compile (/builds/michaelhulsman/footballrs.net/htdocs/content/themes/footballrs.net/node_modules/nunjucks/src/environment.js:527:18), :54:12)
    at /builds/michaelhulsman/footballrs.net/htdocs/content/themes/footballrs.net/node_modules/nunjucks/src/environment.js:471:11
    at eval (eval at _compile (/builds/michaelhulsman/footballrs.net/htdocs/content/themes/footballrs.net/node_modules/nunjucks/src/environment.js:527:18), :27:11)
    at eval (eval at _compile (/builds/michaelhulsman/footballrs.net/htdocs/content/themes/footballrs.net/node_modules/nunjucks/src/environment.js:527:18), :15:11)
    at tryCatcher (/builds/michaelhulsman/footballrs.net/htdocs/content/themes/footballrs.net/node_modules/bluebird/js/release/util.js:16:23)
    at Promise._settlePromiseFromHandler (/builds/michaelhulsman/footballrs.net/htdocs/content/themes/footballrs.net/node_modules/bluebird/js/release/promise.js:547:31)
    at Promise._settlePromise (/builds/michaelhulsman/footballrs.net/htdocs/content/themes/footballrs.net/node_modules/bluebird/js/release/promise.js:604:18)