Thank you. I have added it and get
log4javascript.min.js:1 WARN unknown | setting the value of attribute: size in PsychObject: fix as: undefined
BrowserConsoleAppender.append @ log4javascript.min.js:1
log4javascript.min.js:1 WARN unknown | setting the value of attribute: size in PsychObject: gng_pract as: undefined
BrowserConsoleAppender.append @ log4javascript.min.js:1
log4javascript.min.js:1 WARN unknown | setting the image of ImageStim: gng_react with argument: undefined.
BrowserConsoleAppender.append @ log4javascript.min.js:1
log4javascript.min.js:1 WARN unknown | setting the value of attribute: image in PsychObject: gng_react as: undefined
BrowserConsoleAppender.append @ log4javascript.min.js:1
log4javascript.min.js:1 WARN unknown | setting the mask of ImageStim: gng_react with argument: undefined.
BrowserConsoleAppender.append @ log4javascript.min.js:1
log4javascript.min.js:1 WARN unknown | setting the value of attribute: mask in PsychObject: gng_react as: undefined
BrowserConsoleAppender.append @ log4javascript.min.js:1
log4javascript.min.js:1 WARN unknown | setting the value of attribute: size in PsychObject: text_feedback_pract as: undefined
BrowserConsoleAppender.append @ log4javascript.min.js:1
log4javascript.min.js:1 WARN unknown | setting the image of ImageStim: ITI_pract_2 with argument: undefined.
BrowserConsoleAppender.append @ log4javascript.min.js:1
log4javascript.min.js:1 WARN unknown | setting the value of attribute: image in PsychObject: ITI_pract_2 as: undefined
BrowserConsoleAppender.append @ log4javascript.min.js:1
log4javascript.min.js:1 WARN unknown | setting the mask of ImageStim: ITI_pract_2 with argument: undefined.
BrowserConsoleAppender.append @ log4javascript.min.js:1
log4javascript.min.js:1 WARN unknown | setting the value of attribute: mask in PsychObject: ITI_pract_2 as: undefined
BrowserConsoleAppender.append @ log4javascript.min.js:1
log4javascript.min.js:1 WARN unknown | setting the value of attribute: size in PsychObject: text_pract_end as: undefined
BrowserConsoleAppender.append @ log4javascript.min.js:1
log4javascript.min.js:1 WARN unknown | setting the value of attribute: size in PsychObject: fix_gng as: undefined
BrowserConsoleAppender.append @ log4javascript.min.js:1
log4javascript.min.js:1 WARN unknown | setting the value of attribute: size in PsychObject: gng_stimulus as: undefined
BrowserConsoleAppender.append @ log4javascript.min.js:1
log4javascript.min.js:1 WARN unknown | setting the image of ImageStim: gng_react_2 with argument: undefined.
BrowserConsoleAppender.append @ log4javascript.min.js:1
log4javascript.min.js:1 WARN unknown | setting the value of attribute: image in PsychObject: gng_react_2 as: undefined
BrowserConsoleAppender.append @ log4javascript.min.js:1
log4javascript.min.js:1 WARN unknown | setting the mask of ImageStim: gng_react_2 with argument: undefined.
BrowserConsoleAppender.append @ log4javascript.min.js:1
log4javascript.min.js:1 WARN unknown | setting the value of attribute: mask in PsychObject: gng_react_2 as: undefined
BrowserConsoleAppender.append @ log4javascript.min.js:1
log4javascript.min.js:1 WARN unknown | setting the image of ImageStim: ITI_pract with argument: undefined.
BrowserConsoleAppender.append @ log4javascript.min.js:1
log4javascript.min.js:1 WARN unknown | setting the value of attribute: image in PsychObject: ITI_pract as: undefined
BrowserConsoleAppender.append @ log4javascript.min.js:1
log4javascript.min.js:1 WARN unknown | setting the mask of ImageStim: ITI_pract with argument: undefined.
BrowserConsoleAppender.append @ log4javascript.min.js:1
log4javascript.min.js:1 WARN unknown | setting the value of attribute: mask in PsychObject: ITI_pract as: undefined
BrowserConsoleAppender.append @ log4javascript.min.js:1
log4javascript.min.js:1 WARN unknown | setting the value of attribute: size in PsychObject: ib_break as: undefined
BrowserConsoleAppender.append @ log4javascript.min.js:1
log4javascript.min.js:1 WARN unknown | setting the value of attribute: size in PsychObject: thanks_text as: undefined
BrowserConsoleAppender.append @ log4javascript.min.js:1
log4javascript.min.js:1 WARN unknown | setting the value of attribute: seed in PsychObject: TrialHandler as: undefined
BrowserConsoleAppender.append @ log4javascript.min.js:1
GNG_test1.js:463 pop jitters
GNG_test1.js:464 undefined
core-2020.2.js:1822 TypeError: Cannot read property ‘pop’ of undefined
at Scheduler._currentTask (GNG_test1.js:465)
at Scheduler._runNextTasks (util-2020.2.js:1567)
at Scheduler._runNextTasks (util-2020.2.js:1571)
at Scheduler._runNextTasks (util-2020.2.js:1571)
at update (util-2020.2.js:1524)
window.onerror @ core-2020.2.js:1822
log4javascript.min.js:1 FATAL unknown | {}
BrowserConsoleAppender.append @ log4javascript.min.js:1